normal absence
正常没有
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The process takes place in the absence of oxygen, so many of the normal, noxious byproducts of combustion aren't produced.
WSJ: Grappling With a Garbage Glut
应用推荐
模块上移
模块下移
不移动