Therefore, the changes of moisture and heat from frozen-thaw process in Qinghai-Xizang Plateau is an important outside heat source, which influences East Asia climate.
由此，青藏高原季节冻融过程引起的水热变化是影响东亚气候的一个重要外源。
The stack is thermoacoustic source of thermoacoustic engine. It absorbs heat energy from outside heat source to compensate for heat loss of the thermoacoustic engine and keep the engine oscillate.
回热器是热机系统的热声源，从外热源吸收热能补偿热机系统的能量耗散，维持系统的热声振荡。
Unlike a passive solar home, an active solar home uses mechanical equipment, such as pumps and blowers, and an outside source df energy to help heat the house when solar energy is not enough.
与消极供暖房屋不同的是，积极供暖房屋使用机械设备，比如泵、风箱，以及外部的能量源，以保证太阳能不足时也可以给房屋供暖。
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