1. 释义：
2. 理解：ground作为名词意思很多, 常被用于表示“理由”“根据”，可替换"reason", "because"，丰富语言表达。
ground表示“理由”时，都是用复数形式出现。
我们常说的“实锤”，就可用grounds.
"on the grounds of/that"，表示“因为…的理由”“以…为根据”。
3. 应用：
2）《牛津英语搭配词典》，ground作名词表示“理由”时的常用搭配：
adj+ground: good/reasonable/sufficient/valid;
verb+grounds:
have grounds for/give sb. grounds
prep+ground:
on the grounds of
adv firmly 以…为稳固的基础
2）翻译：因为英文不太好，他拒绝了邀请。
He turned down the invitation on the grounds of the poor of his English.
3) 造句
He told his mother that he would not be home till late on the grounds of working overtime.(他以加班为由告诉妈妈他要晚归）
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