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【emit】
英英:give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
例句:
1.Since they emit light directly, OLED displays do not need a backlight.
由于也是自身发光,OLED显示器可以不用背光灯。
2.Industries that emit carbon dioxide would have to buy permits to do so.
排放二氧化碳的产业必须要购买排放量之类的。
3.Earthquakes emit three types of waves which have their own characteristics.
地震发出两种波,它们有各自的特征。
近义:deliver, ray
【prehistoric】
还原:history→prehistory→prehistoric
例句:
1.The beginning of libraries came after the end of the prehistoric era.
图书馆起源于史前时代结束之后。
2.His ideas on morals are really prehistoric .
他的道德观念真是太陈腐了。