(意外) accident;mishap;contingency;unfathomable ;

As a precaution, the marrow houses a standby force of fully developed white cells.
为了预防不测, 骨髓中还储存着已经完全成熟的白血球后备军.
来源:词典精选例句Perhaps he obtained it as his last and utmost precaution against evil yesterday.
或许昨天他才得到它,以备万一,预防不测的.
来源:词典精选例句
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