Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
免费的
先理解核心含义，再看它在真实句子里的用法。
免费的；无理由的；[经] 无代价的
without cause
a gratuitous insult
正在加载中文释义…
without cause
正在加载中文释义…
costing nothing
正在加载中文释义…
unnecessary and unwarranted
complimentary tickets
free admission
a strikers' tent camp...was burned with needless loss of life
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT.