虽然他现在的处境不太好，但他一直很乐观。

Suīrán tā xiànzài de chǔjìng bù tài hǎo, dàn tā yìzhí hěn lèguān.

Although his situation is not very good now, he has always been optimistic.

为了保护自然环境，我们应该少用塑料袋。

Wèile bǎohù zìrán huánjìng, wǒmen yīnggāi shǎo yòng sùliàodài.

In order to protect the natural environment, we should use fewer plastic bags.

在这种环境下，他很难安心学习。

Zài zhè zhǒng huánjìng xià, tā hěn nán ānxīn xuéxí.

In this kind of environment, it’s hard for him to study in peace.