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汉语拼音：bì hé

首尾相连；封闭；合上：～循环系统。老人轻轻地～上双眼。

• A wormhole which connects (usually closed) universes is often called a Schwarzschild wormhole.

  一个连接宇宙的虫孔（通常闭合的）常常是被称做Schwarzschild虫孔。

• Researchers need two very dense objects orbiting very close together, and they have to be able to detect what is going on between them.

  研究者们需要两个密度极高的物体，并让它们的轨道闭合在一起，此外研究者还要有能力对它们进行观测。

• Breathe out through pursed lips as if you were whistling. Feel the hand on your belly go in, and use it to push all the air out.

  从闭合嘴唇中呼气，就好像在吹口哨。感觉那只在腹部上的手回落，用这只手将所有空气推出。

• A clutch actuator is then activated in such a way that the friction clutch is closed up to the clutch rest point.

  随后这样操作离合器促动器，使摩擦离合器直至该离合器静止点闭合。

• But with this opening of what had been a mostly closed system, possibilities emerge, literally without limit.

  但是随着曾经闭合的系统逐渐开放，其发展潜力也慢慢浮现，或者可以说是潜力无限。

• In practice small amounts leak in and out in industrial systems, but overall, the bulk of mass circles in a " closed loop . "

  实践中工业系统少不免有小量的泄漏，但总体说来，大多数物质都在一个“闭合环路”里面循环。

• And I said yes. Then he stretched his leg over the hole, and the hole sealed up. He took me home.

  我说想，然后他把腿伸过了那个洞，那洞就闭合起来了，他把我带回了家。

• Finished with polished metal, the wall lamp opens like an eyelid to light your place, while you may close its lids to turn the lamp off.

  由抛光的金属制成，这款壁灯像眼皮那样睁开来照明，而你可以闭合它的眼皮来关灯。

• One of the only exceptions is the theoretical "sterile neutrino" , represented by a closed loop of string.

  仅有例外之一是理论上的“惰性中微子（sterileneutrino）”，它由弦的闭合环来表示。