在允许操作低温液体和它的相关设备之前，人员必须对性质和安全的考虑完全熟悉。
Personnel must be thoroughly familiar with the properties and safety considerations before being allowed to handle a cryogenic liquid and its associated equipment.
不同的树种对土壤的形成和性质有不同的影响。
Different species have different influences on soil formation and soil properties.
对许多人来说，丈夫和妻子似乎不足以构成一个真正意义上的家庭——他们需要孩子来丰富他们的小圈子，验证这个小圈子的家庭性质，并从子孙后代那里获得某种弥补的影响。
To many people, husband and wife alone do not seem a proper family—they need children to enrich the circle, to validate its family character, to gather the redemptive influence of offspring.
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