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1·He spent hours throwing a tennis ball against a wall.

他花了数小时对着一堵墙扔网球。《柯林斯英汉双解大词典》

2·My father would burst into the kitchen bouncing a tennis ball.

我父亲会拍打着网球闯进厨房。《柯林斯英汉双解大词典》

3·I spent many hours mindlessly banging a tennis ball against the wall.

我花了好多个小时单调地对着墙打网球。《柯林斯英汉双解大词典》

4·I have here a tennis ball.

我这里有个网球。

5·This tennis ball has no more bounce.

这个网球已经没有弹力了。

6·Last week a tennis ball hit me on the head, but I tried to ignore the pain, believing that it would go away sooner or later.

上周，一个网球击中了我的头，但我试图忽视疼痛，相信痛感迟早会消失的。

7·This is a table tennis ball.

这是一个乒乓球。

8·So, look at the tennis ball first.

首先，看网球。

9·There is air drag on that tennis ball.

网球受到空气阻力。

10·The largest is the size of a tennis ball.

最大一块有一个网球那么大。