连字符加不加都可以.
表达几分之几的时候前面用基数词,后面用序数词.当前面的数字大于一的时候后面的序数词要加s.比如五分之一one-fifth,三分之一one-third,而五分之二就是one-fifths,四分之三three-fourths.
我记得是这样的,仅供参考.
一句课文是 这样 的 The gravity on the suiface of mars is about two-f
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