But its practical tools for preventing deflation are limited .

但它能用于预防通货紧缩的工具是有限的。

These work by preventing the growth and spread of bacteria .

四环素抗生素通过阻止细菌的生长和扩散起作用。

Middle-class conservatism may even be preventing some countries from making the leap toward democracy .

中产阶级的保守主义甚至会阻碍一些国家向民主大步前进。

Preventing concussions is mostly common sense .

预防脑震荡几乎是常识。

The time to start preventing the next crisis is now .

现在就是开始预防下一次危机的时候。