useful的用法1.The book is useful _______ students of English.2.
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useless 和 useful是两个意思相反的单词uselessa.1.无用的;无价值的The blunt knife is useless.这把钝刀毫无用处.2.无效的;无益的I realized it was useless to reason with him.我知道和他说理是毫无意义的.3.【口...