他做事一向很周密，连最小的细节都不会忽略。

Tā zuòshì yíxiàng hěn zhōumì, lián zuì xiǎo de xìjié dōu bú huì hūlüè.

He has always been very meticulous in his work and never ignores even the smallest details.

这次活动准备得很周密，几乎没有出现什么问题。

Zhè cì huódòng zhǔnbèi de hěn zhōumì, jīhū méiyǒu chūxiàn shénme wèntí.

This event was prepared very thoroughly, and almost no problems occurred.

做重要决定前，最好先进行周密的调查和分析。

Zuò zhòngyào juédìng qián, zuìhǎo xiān jìnxíng zhōumì de diàochá hé fēnxī.

Before making an important decision, it’s best to carry out thorough research and analysis.