当贷款者选择支付低于正常的到期利息时，此类贷款的余额就会增加。
The balance of such loans increases when borrowers choose to pay less than the normal interest due.
以往大多数研究针对的是短期内完全不睡眠，而不是在一个阶段内的把每天的睡眠时间限制在低于正常的水平上。
Previous studies mainly aim at total sleep deprivation during a short period instead of restricting sleep time every day on a Lev el shorter than normal.
事实是，克雷蒙小提琴由生长在小冰河时期的树木制成，当时整个欧洲的气温明显低于正常水平。
Turns out the Cremonese violins were made from trees that grew during a Little Ice Age, a period when temperatures across Europe were significantly lower than normal.
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