near field source的用法和樣例：
例句
- The principle and field source of high frequency earth electromagnetic survey has been concisely introduced.
扼要介紹了高頻大地電磁測量的方法原理和場源機制。 - Because of the same reason, the singular property of the wavefield near the source point can be treated analytically.
基於同樣的原因，場源附近的波場奇異性可以精確地算出。
