这种药膏有膏状的或是凝胶状的。你想要哪种呢？
Pharmacist: this burn ointment comes in a cream or a gel, which would you prefer ?
膏状和凝胶状牙膏通常含有一些像甘油这一类能够防止牙膏脱水的物质。
Paste and gel formulations often contain substances like glycerol to prevent the toothpaste from drying out.
必备知识：胆固醇是一种油腻的膏状物，由肝脏产生并携带于血管中。
What you're supposed to know: a waxy, fatty material, cholesterol is produced by the liver and carried in the bloodstream.
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