四川一民警抓捕命案逃犯时壮烈牺牲，两名犯罪嫌疑人畏罪自杀

Use 时 after a verb or verb phrase to turn it into a time clause (‘when…’). The action before 时 happens at the same time as or just before what follows. Learners can use it to describe background actions or simultaneous events.

Chinese uses classifiers between numbers and nouns. The pattern 数词+量词+名词 is required when counting people or objects; different nouns take different classifiers (e.g., 名 for people).

A topic is introduced first (often followed by a comma) and the comment gives information about it. This structure emphasizes the topic and is common in written Chinese, especially announcements.

This formal pattern means “without … one must not ….” It is often used in notices to prohibit actions unless permission has been obtained.

Commands often use the verb directly without a subject. The verb-object phrase tells the listener what to do, such as downloading or scanning.