1. 介词使用(of/to/in…) 课堂回顾: 过中秋节的习俗于唐代早期在中国各地开始流行。 过中秋节的 习俗 于唐代早期 在中国各地 开始流行。 习俗 过中秋节的 开始流行 于唐代早期 在中国各地 。 The tradition of celebrating mid-autumn day became popular at the begi...
in the room without heating the air. It does this by producing radiation heat that travels like light waves. When the quartz crystal in the heater vibrates at a particular frequency, its energy is turned into infrared radiation. The radiation is th...
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