Carefully she covers them and lumbers away.
它把这些卵仔细地盖好,然后慢吞吞地走开了.
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Research shows that the intrinsic frequency of hole defect lumbers is little lower than standard lumbers.
研究表明,含有孔洞试件的固有频率与标准试件相比略低一些,但差别不大.
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