2011年，澳大利亚针对1621人进行的一项研究发现，每天随机选择涂抹防晒霜的人患黑色素瘤的几率是按需使用防晒霜的人的一半。

A 2011 Australian study of 1,621 people found that people randomly selected to apply sunscreen daily had half the rate of melanomas of people who used cream as needed.

youdao

这就是说，您应该尽量按需使用内存。

That said, you should only use as much memory as required.

youdao

不受限制的涂抹，按需使用来缓解症状。

Apply liberally and use as often as desired to relieve symptoms.

youdao