Matsutake can keep fresh for 3 days at most.

松茸保鲜的极限是三天。

Youth is not like a new garment, which we can keep fresh and fair by wearing sparingly.

青春不同于一件新衣，少穿可以保持常新常美。 青春，一旦有了它，就该日复一日地去利用它，因为它会很快消逝的。

The function of the main fan in coal mine is to keep fresh air and reduce the concentration of gas.

煤矿主扇风机的主要功能是保证井下空气畅通新鲜，降低瓦斯浓度。

How do you develop your aesthetic sense? As usual time, what sorts of music, films and books make you keep fresh mind?

如何保持美感敏锐度？平常喜欢听的音乐或阅读的书籍是什麽？

I will keep fresh the grassy path where you walk in the morning, where your feet will be greeted with praise at every step by the flowers eager for death.

我要保持您晨兴散步的草径清爽新鲜，您每一移步将有甘于就死的繁花以赞颂来欢迎您的双足。