Keep one eye on the air speed and the other on the ball.
保持一只眼睛对空气的速度和其他对球。
The chameleon can keep one eye on its prey and the other on its footing.
变色龙可以一眼盯着牠的猎物,另一眼看着牠立足的地方。
It isn't easy to concentrate on one's work when you've got to keep one eye on a baby that's crawling all over the place.
一边要照看一个到处看到处爬的小孩,一边又要专心工作,可不是件容易的事。
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