研究者们还需要判断嗅觉到底是一种还是两种感觉，一种感觉回应气味本身，另一种感觉记录空气中无味的化学成分。
Researchers have still to decide whether smell is one sense or two—one responding to odours properly and the other registering odourless chemicals in the air.
通过将气味的独特结合，研究中使用的无味食物粉末出现在Sensa体系之中，唯一一个申请专利的减肥体系。
The unique combination of scented, flavorless food sprinkles used in the study is now found in Sensa, the only weight loss system that contains the patent-pending technology.
盐酸林可霉素是一种白色或几乎白色结晶性粉末，是无味或有微弱的气味。
Lincomycin hydrochloride is a white or practically white, crystalline powder and is odorless or has a faint odor.
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