Radiation also is released from man-made sources such as X-ray machines, television sets, and microwave ovens.
X光机、电视机、微波炉等是人造的辐射来源。
A brave man as long as there is a ray of hope will not be crushed.
勇敢的人只要尚存一线希望就不会被击垮。
A brave man as long as there is a ray of hope will not be crushed.
勇敢的人只要尚存一线希望就不会被击垮。
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