法医检测不能指证他；别的小贩证明他当时不在场；而目击者甚至说不出他长什么样子。
Forensic tests were negative; fellow stallholders gave him an alibi; the one supposed witness could not even describe his appearance.
该液体检测不出含硫，可借助缓和加氢精制转化成高度饱和的合成燃料。
The liquids contain no detectable sulfur and can be converted by mild hydrotreating into highly saturated synthetic fuel.
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