smoke tracer造句

• This disqualified nicotine, a common tobacco-smoke tracer for indoor studies, because it tends to break down between the gas and particle phases.
• In Version 1.1, more weapons were added, such as Napalm, Smoke Tracers, and Liquid Dirt as well as Joystick support and two new death animations among other things.
• It's difficult to find smoke tracer in a sentence. 用smoke tracer造句挺難的