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all at once	If people are doing something all at once, they are doing it all at the same time. If people jump into a swimming pool all at once, they all jump in at the same time. If you put five sticks of gum in your mouth all at once, you put all of them in your mouth at the same time. You don't put them in one at a time. [1/2 definitions]
bail out	(informal) to jump from an airplane with a parachute.
ballet	Ballet is a type of dance that uses exact, graceful movements. The names of the movements come from French. Girls who study ballet wear special shoes that let them dance on their toes. Boys study ballet too, and they have to be very strong to jump high and to lift up the girls. It takes a lot of practice and strength to become very good at ballet. [1/2 definitions]
bounce	a sudden spring or jump. [1/4 definitions]
compare	We use the word "compare" to say that one thing is like another thing. If your sister likes to jump across the yard, you might compare her to a kangaroo. [1/3 definitions]
dance	to jump or skip along in excitement. [1/7 definitions]
dive	When you dive, you jump down from a high place with your head and arms going first. When a bird or airplane dives, it changes its position in the air and heads very fast toward a lower place. [2/4 definitions]
diver	A diver is a person who dives into water from a board or platform. When someone dives, they jump into water with the head and arms entering the water first. [1/2 definitions]
excited	When people are excited, they are not calm or bored. They might be very happy about something that is going to happen, or they might be upset or very worried. When a dog is excited, the dog barks a lot. When people are excited, they sometimes shout, or talk quickly, or jump up and down.
excitement	Excitement is a feeling or display of strong emotion. If you feel excitement about something, you might jump up and down about it, or maybe you can't sleep because of it. Excitement is often a very happy feeling about something that is going to happen, but sometimes it is a feeling of being scared or nervous. Excitement makes your heart beat faster. [1/2 definitions]
Fahrenheit	When we use the word Fahrenheit, we are talking about a system people can use when they measure temperature. In America, people use the Fahrenheit system, but, in most other countries, they use a system called Celsius. When you see the letter F after a temperature, as in 72� F, the F stands for Fahrenheit. When it is zero degrees outside measured by the Fahrenheit system, it is very cold and you need a heavy coat to stay warm. When it is 100 degrees measured by the Fahrenheit system, it is very hot, and you probably want to jump in a swimming pool!
farther	When you jump farther than someone else, it means that you jump a greater distance than they do. [1/2 definitions]
flea	a tiny insect that does not have wings but can jump far. Fleas feed on the blood of the animals they bite.
free-fall	the first stage of a parachute jump, before the parachute opens.
high jump	a contest in which each person jumps over a bar which is raised after each successful jump.
hoop	A hoop is a large ring of wood, plastic, or metal that is used as exercise equipment, a child's toy, or as something for an animal to jump through. [1/3 definitions]
hop¹	to make a short, quick leap or leaps. [3/4 definitions]
hopscotch	a children's game in which players toss a stone onto a pattern of numbered squares drawn on the ground. The players then hop or jump from square to square, picking up the stone as they move.
impala	an African antelope with long legs and reddish brown fur. Male impalas have long, curved horns. Impalas can jump up to ten feet in the air, higher than any other kind of antelope.
jump	When you jump, you push yourself up into the air with your legs. [9/10 definitions]
jump rope	a rope held at each end and swung under the feet and over the head as a person jumps. Jump ropes are used for exercise or as a game.

BOB半岛

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