- 一线: a thread; a ray of; a gleam ...
- 声: sound; voice
- 机: machine; engine
- 一线: a thread; a ray of; a gleam of 云朵中的一线青天 a break in the clouds; 一线微弱的希望 a faint gleam of hope; 一线光明 a ray of light; 透过帘子的一线微光 a glimmer of light through the curtains
- 短基线声纳: short baseline sonar
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