越过波浪。
You must go over the instructions of how it works before you use the micro-wave oven.
在使用微波炉前要先看看它的使用说明。
You must go over the instructions of how it works before you use the micro-wave oven.
在应用微波炉前要先看看它的应用阐明。
Diffraction - not only will a wave of sound reflect or absorb but it can go over the obstacle.
衍射-声音虽然会被反射已经吸收，但是他能绕过阻挡物。
Diffraction - not only will a wave of sound reflect or absorb but it can go over the obstacle.
衍射-声音虽然会被反射已经吸收，但是他能绕过阻挡物。
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