external coupling的用法和样例：
例句
- The expansion-side of the heat-pump is thermally coupled to the heat-source, which is often the external environment.
扩展方面的热泵热耦合的热源，这往往是外部环境。 - The phase holograms are expected to be able to guide the emission straight out from the OLED device and hence the external light coupling efficiency can be improved.
这种相位全像术可以预期将发射出来的光直线导出有机发光二极体元件因此可以改善外部发光耦合效率。
