mixing ratio的用法和樣例：
例句
- A nearly constant air-fuel ratio is maintained by the main metering system from part-to-wide-open throttle.
從節氣門部分開啟到全部開啟，主計量系統保證了空燃混合比幾乎恒定。 - For firing of the mixture in the cylinder every time spark occurs, the air-fuel ratio must lie in a fairly narrow range.
為了在氣缸里每一時刻發生一次火花時混合氣的燃燒更理想，空一燃混合比必須限于相當狹窄的區域內。
