在野外活动中，要随时留神野生动物的出现。

Zài yěwài huódòng zhōng, yào suíshí liúshén yěshēng dòngwù de chūxiàn.

During outdoor activities, always be alert to the presence of wild animals.

留神听老师的讲解，才能更好地理解知识。

Liúshén tīng lǎoshī de jiǎngjiě, cáinéng gèng hǎo de lǐjiě zhīshì.

Pay attention to the teacher's explanation to better understand the knowledge.

孩子们在玩耍时，大人们要留神保护他们。

Háizimen zài wánshuǎ shí, dàrénmen yào liúshén bǎohù tāmen.

Adults should be attentive to protect children while they play.