His only connection to the outside world was an air tube and a bell. Each day he rang a bell to let those outside know that he was still alive.

墓内的僧人和外界的一切联系只有一根输气管和一个铃铛，每天僧人都会摇铃使外面人知其还活着。

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His only connection to the outside world was an air tube and a bell.

僧人与外界唯一的联系就只通过通气管与铃声。

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This paper focuses on the aspect that the tube set connection types are found to have an effect on the heat transfer performance in the air-cooled condensers through a series of type tests.

本文通过对空冷冷凝器的试验研究，说明不同管组连接方式对空冷冷凝器的传热有一定的影响。

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