SAT词汇讲解之前缀：bi-
<p> 14、<span word="bi">bi</span>-表示两个，两</p><p> <span word="biweekly">biweekly</span>双周刊</p><p> <span word="bilingual">bilingual</span>双语种的</p><p> <span word="biennial">biennial</span>两年一次的</p><p> <span word="biannual">biannual</span>一年两次的</p><p> </p>
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