?弱谱线近似

... 弱谱线近似 weak-line approximation 弱线金牛 weak-line T Tauri star 弱线极限 weak-line limit ...

?弱线近似

... 弱线极限 weak-line limit 弱线近似 weak-line approximation 弱线峡谷 weak-line gorge ...