parentheses
[pə'renθəsi:z]
n.
圆括号，插入语，插曲（ parenthesis的名词复数 ）;
例句:
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Answer these questions, using the words in parentheses. Put the apostrophe in the right place.
用句后括号中的词或词组来回答问题, 注意撇号的位置.
来自《简明英汉词典》
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Irregular forms are given in parentheses .
不规则形式标注在括号内。
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When you make a mistake, cross it out; don't use parentheses.
当你写错时, 把它划掉, 不要用括号括起来.
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His weathered cheeks etched parentheses around his mouth.
来自NEWYORKER
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When Shechtman made this discovery, he also drew a picture of it, and he made a note, in the parentheses tenfold??
来自SA
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He adds that acronyms are fine to use but spelling them out in parentheses might be smart.
来自WSJ