The compounds have the connecting ring structures of piperazine or piperidine, have notable antitumor activity, and provide a new choice for preparing antitumor drugs in clinical practice.
该类化合于具有哌嗪或哌啶的连接环结构，且具有显著的抗肿瘤活性，为临床上制备抗肿瘤药物提供了新的选择。
The ring road connecting the main cities, the symbol of reconstruction, became perilous.
联系各主要城市的环城公路是重建的象征，也变得岌岌可危。
Generally, do not remove components (including valve, connector, rubber, plastic ring and copper cap) before the tubing for connecting indoor, outdoor units are prepared.
一般地，如果没有准备好连接室内、外机组的配管，请勿拆卸部件(阀门、接头、橡胶、塑料圈及铜帽等元件)。
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