由于森特维尔有不少家长抱怨说，他们太忙了，没有时间教青少年开车，所以为了保证这些青少年的安全驾驶，一些其他的指导是必要的。
Since a number of parents in Centerville have complained that they are too busy to teach their teenagers to drive, some other instruction is necessary to ensure that these teenagers are safe drivers.
做事保险一点，能保证你有时间关心一下你自己的成绩和工作。
Playing it safe guarantees you'll have more time and energy to think about your grades or your work.
会有时间的旧的和新的设计保证印章的同时将目前在市场上。
There will be a time where the old and new design of the seal of guarantee will be present simultaneously in the market.
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