How fast a marathon could I potentially run?
我跑马拉松的速度可能有多快？
This gives us an idea of how fast a large ice sheet can melt.
这告诉了我们冰原会以多快的速度融化。
It all comes down to how fast a machine can perform an operation.
归结起来就是一个机器完成一个操作能有多快。
How fast a machine works is one of its important characteristics.
工作速度是机器的重要特性之一。
An impulse held me fast — a force turned me round.
但是一种冲动攫住了我——一种力量使我回过头来。
An impulse held me fast — a force turned me round.
但是一种冲动攫住了我——一种力量使我回过头来。
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