smokelessly

常见例句

• An effective system uses fuel that ignites easily, burns as smokelessly as possible.
  有效的加热系统所用的燃料必须易于引火，燃烧时尽可能无烟。
• 33. An effective system uses fuel that ignites easily, burns as smokelessly as possible.
  有效的加热系统所用的燃料必须易于引火，燃烧时尽可能无烟。
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