1 PHRASAL VERB 追查清楚;清查 If you chase up something that is needed or needs dealing with, you find it or find out what is being done about it. 追查清楚;清查
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When I didn't hear from the suppliers or receive a refund, I chased the matter up. [VERB noun PREP.]
我既没收到供货商的消息，也没拿到退款，于是开始追查此事。
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The authority can chase up the source of the pollution and demand that the owner clean it up. [VERB PREP. noun]
当局可以追查到污染的源头，责令业主负责清理。
2 PHRASAL VERB 敦促;追着…索要 If you chase someone up, you look for them and find them because you want them to do something or give you something. 敦促;追着…索要 [Also VERB n PREPOSITION]