The guide led them to the rear of the glade, where they were able to observe the sleeping groups.

这时，向导不让大家继续待在目前躲藏的这个地方了，他把他们领回林里的空地上。

In the rear half, the index is falling in time and, correspondingly, the wave's frequency is increased.

在脉冲的后半部，强度及折射率随时间减小，所以反过来，会使波动的频率升高。

We had to operate without a rear area to fall back on. You can imagine how difficult it was!

那时搞无后方作战，困难是可想而知的。

The hall is in the rear of the building.

礼堂在大楼的后部。

※It takes ten years grow trees,but a hundred to rear people. 十年树木,百年树人.

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