(1) The meanings and usages of "if", "if" and "Ruo" are basically the same. "If" is often used in spoken language, "if" is used in written language, and "if" is most commonly used.<br>(2) "If" and other words can also appear in the latter clause, indicating supplementary explanation of the hypothetical situation.<br>(3) Such monosyllabic words as "ru" are mostly used in written language.<br>
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