做同义转换：Take the first trueing on the left.—— —— —— the first
做同义转换：Take the first trueing on the left.—— —— —— the first crossing.
做同义转换：Take the first trueing on the left.—— —— —— the first crossing.
做同义转换：Take the first trueing on the left.—— —— —— the first crossing.
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