市场组合是所有投资者都应该持有的唯一组合。

Collaboration across nations is key to preserving marine ecosystems.

I'm a proud non-reader of books.

慈祥的母亲大多都有着败家的儿女，这是因为他们不忍心强加管教子女的缘故。

The ruling class has the means of material production at its disposal; the proletariat has nothing but their labor power.

在炮火下进入脑海的思想会牢固而永久地留在那里。