In clusters the stars are always passing by each other and exchanging energy via their gravity.
在星团中，恒星总是彼此擦肩而过，通过它们的引力交换能量。
老托福听力93篇集锦
Land, water, and ice each affect this energy exchange differently.
土地、水和冰对这种能量交换的影响各不相同。
英语百科
Exchange interaction
（重定向自Exchange energy）
In physics, the exchange interaction (with an exchange energy, and exchange term) is a quantum mechanical effect that only occurs between identical particles. Despite sometimes being called an exchange force in analogy to classical force, it is not a true force, as it lacks a force carrier.