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only的倒装
① Only+介词短语：
Only by keeping down costs will America maintain its competitive advantage over other countries.
只有通过保持低成本美国才能保持对其他国家的竞争优势。
② Only+状语从句：
Only when each logical step has been checked by other mathematicians will the proof be accepted.只有在每个逻辑步骤都由其他数学家验证之后，该证明才会被接受。
① Only+介词短语：
Only by keeping down costs will America maintain its competitive advantage over other countries.
只有通过保持低成本美国才能保持对其他国家的竞争优势。
② Only+状语从句：
Only when each logical step has been checked by other mathematicians will the proof be accepted.只有在每个逻辑步骤都由其他数学家验证之后，该证明才会被接受。
