directional transmission的用法和样例：
例句
- Therefore the square resonator with an output waveguide is a promising candidate to realize single-mode directional emission microcavity lasers.
因此带输出波导的正方形谐振腔是一种可以获得单模定向发射的微腔激光器，具有广泛的应用前景。 - We fabricate slightly deformed fused-silica microspheres in which whispering gallery modes possess remarkably directional escape emission from the microsphere boundary.
设计了些微变形的熔融石英微球体，其中回音廊模式可从微球体的边界定向发射。
