仔细 + 的 + Noun / 仔细 + Verb
仔细 (zǐxì) is an adjective meaning "careful," "attentive," or "thorough." It describes a meticulous approach to a task, such as 仔细的研究 (careful research). It can also be used as an adverb before a verb, as in 仔细看 (look carefully).
她仔细检查了每一份文件才签字。
Tā zǐxì jiǎnchá le měi yī fèn wénjiàn cái qiānzì.
She carefully checked every document before signing.
你要仔细听老师讲的每一个要点。
Nǐ yào zǐxì tīng lǎoshī jiǎng de měi yī gè yàodiǎn.
You need to carefully listen to every key point the teacher explains.
他仔细地观察着地图,寻找正确的路线。
Tā zǐxì de guānchá zhe dìtú, xúnzhǎo zhèngquè de lùxiàn.
He carefully observed the map, looking for the correct route.