1·In normal circumstances, however, the SCN reacts to the lengthening nights by instructing the brain's pineal gland to secrete more of the hormone called melatonin.
然而，在正常情况下，SCN对夜晚延长的反应是，它会指示大脑的松果腺增加褪黑激素的分泌。
2·At a time of austerity and lengthening lifespans.
但在严厉的时刻和延长的期限的条件下。
3·The Educational Testing Service, which designs the exam, had already delayed planned revisions by a year, including lengthening the exam from two-and-a-half to four hours.
{2}设计该项考试的美国教育考试服务中心已经将这一修改计划延迟了达一年之久，修改计划包括将考试时间从两个半小时延长至四个小时。
4·Traveling is one way of lengthening life, at least in appearance.
旅行是一种延长生命的方法，至少从外表上看是如此。
5·In various kinds of natural environment, timber's antiseptic and lengthening of lifespan are the goal of both modern timber structure building industry and outdoor wooden horticulture view facility.
在各种自然环境中，木材的防腐和延长使用期限是现代木结构建筑工业和户外木质园艺景观设施致力追求的目标。