xiě / wén / zhāng / bù / néng / yǒu / tóu / wú / wěi / yào / yǒu / yí / gè / wán / zhěng / de / jié / wěi

写文章不能有头无尾，要有一个完整的结尾。

When writing an essay, you can't just have a beginning without an ending; it needs a proper conclusion.