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The children compete against each other to reach the other end of the pool.
compete against 与……竞争，与……抗衡
我们无法在价格上与他们竞争。
We can't compete against them on price.
Many pedal their tricycles, but most of them prefer to push or drag them.
prefer to do rather than (to) do
比较喜欢 <做…>
我宁可等待而不是立刻去
I prefer to wait rather than go at once.
Whether they will ever become future Olympic champions, only time will tell.
★这是一个倒装句，宾语从句置于句首。通常，以疑问词引导的宾语从句会用于这种句型：
没人知道是什么让他这样做。
What made him do it, no one knows.
他们是怎么找到真相的，只有George才知道。
How they found out the truth, only George can tell.
他们怎么解决这个问题，只有天知道。
How they solve the problems ,only the God knows.
Some children can cover the whole length of the pool without coming up for breath even once.
cover 走完、读完、看完、飞过（不用于被动）
我们一天可以走多远？
How far can we cover a day ？
在不到10分钟她游了 1000米。
She covered 1,000 meters in less than 10 minutes .
come up 上升
太阳升起来了
The sun has come up .
