问题补充:
per cent 和percent 的区别?because the moon has only an eightieth of the earths mass,it require97 per cent less energy to travel the quarter of a million miles from the moon to earth-orbit than the 200 mi
答案:
percent 是百分率 百分比 78 percent 78% .
per cent 是两个单词 per 是“每一”的意思 cent 是“分(钱的单位)”的意思
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