gas composition的用法和樣例：
例句
- The solar system began as a disk of dust and gas swirling around the young sun.
太陽系一開始是一個由灰塵和氣體組成的圓盤，圍繞年輕的太陽旋轉。 - The PQR shall include the composition and flow rate of the shielding and inert gas backing, when used.
焊接工藝評定記錄單上應包括封底焊時所用的惰性保護氣體組成成分和流率。 - A new method for recognizing gas components in air based on nonlinear fluorescence spectra combined with a neural network model was proposed.
提出利用物質的熒光光譜聯合人工神經網路識別大氣中雜質氣體成分的新方法。
