下面这句话怎么解释?The business of continuing the family lineage and keeping the bloodlines pure is often too important to be left to romance and chance encounters.句子中to be left.为什么会是to be?

? 这句话怎么解释? 怎么解释这句话? The worst part about .这句话中ever怎么解释! 解释下下面这句话的意思, 结构施工图 如图：最下面那句话怎么解释? “我爱你”这句话怎么解释 这句话怎么解释.英文 不猴不性福、这句话怎么解释 癞蛤蟆想吃天鹅肉这句话怎么解释? 民以食为天 这句话怎么解释 民以食为天 这句话怎么解释. 退一步海阔天空这句话怎么解释? The moonlight is shining in through the window.这句话怎么解释,怎么两个介词连用? The youth,the love for the idiot.这句话怎么解释 下面这句话怎么解释?The business of continuing the family lineage and keeping the bloodlines pure is often too important to be left to romance and chance encounters.句子中to be left.为什么会是to be? The reach of the War这句话怎么翻译,reach在这里当什么解释? 这句话该怎么解释The expenditure is small compared to the expenditure on nuclear research It's the thoutht that counts.句中count怎么解释这句话具体怎么分析