The four engines are numbered one through four, left to right.
四个引擎从左到右依次标号：一，二，三，四。
You'll probably need a lot of time to work this one through.
你可能要花很多的精力来做这件事情。
Then do exercises one through ten on page 21.
然后做第二十一页上的练习题一至十题。
Just going one-by-one through the whole list will be very difficult.
只是按照词表一个一个地背会非常困难。
Just going one-by-one through the whole list will be very difficult.
只是按照词表一个一个地背会非常困难。
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