您要查找的是不是：
- artificial closed ecosystem 人工密闭生态系统
- People were not necessary for a closed ecosystem to run once stable, but they might be helpful in stabilizing it. 封闭系统一旦进入稳定运行，人类就不是必不可少的部分，不过，他们可能会有助于其稳定。
- This dress is made of artificial fibers. 这件衣服是人造纤维的。
- Her artificial gaiety disguised an inner sadness. 她以矫揉造作的快乐掩饰著内心的悲痛。
- I can't stand his artificial smiles. 我受不了他的假笑。
- I was fitted an artificial tooth by the dentist. 牙医给我镶了颗假牙。
- He closed the deal successfully and was home free. 买卖成交了，他松了一口气。
- The boss readily closed with the offer. 老板马上接受了这个报价。
- Have you closed the gate and windows? 你把门窗关严实了吗？
- Artificial heating hastens the growth of plants. 人工供暖能促进植物生长。
- He closed his speech with a funny joke. 他用一则有趣的笑话结束了演讲。
- Her artificial manner made me sick. 她那装腔作势的样子令我恶心。
- That oyster closed up its valves. 那个牡蛎把壳合拢起来。
- The room was decorated with artificial flowers. 房间用人造花装饰。
- This product contains no artificial preservatives. 此产品不含任何人造防腐剂。
- The Waterloo line is closed for repair. 滑铁卢铁路线因维修关闭。
- This project has been closed up. 这个项目已终止了。
- This road is closed to motor vehicles. 这条路机动车不准通行。
- This yoghurt contains no artificial flavouring or colouring. 这种酸乳酪不含人造香料或著色剂。
- Nuclear physics is a closed book to me. 核物理学是我完全不懂的一门学科。
