通过传输条件实现各子域间的耦合。
Coupling of different subdomains is achieved through the transmission condition at the interface.
然而，由于这些传输条件是全局相关的，在实际计算中不易实现。
These conditions are, however, nonlocal and are not applicable in practice.
推导出了声光调制通信原理的有关公式，通过实验给出了最佳传输条件。
The principle of acoustooptic communication is presented, and the best transmission condition is obtained by experiments.
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