directional transmission的用法和樣例：
例句
- Therefore the square resonator with an output waveguide is a promising candidate to realize single-mode directional emission microcavity lasers.
因此帶輸出波導的正方形諧振腔是一種可以獲得單模定向發射的微腔激光器，具有廣泛的應用前景。 - We fabricate slightly deformed fused-silica microspheres in which whispering gallery modes possess remarkably directional escape emission from the microsphere boundary.
設計了些微變形的熔融石英微球體，其中迴音廊模式可從微球體的邊界定向發射。
