青蛙也不例外。根据动物行为杂志发表的研究表面，它们似乎特别喜欢在沟槽里聆听柔顺的声音。
Frogs, too, apparently like to hear something smooth when they're in their groove, according to research published in the journal Animal Behavior.
蜡：一类来源于动物、植物、矿物的或合成的柔顺性物质中的任何一种，和脂肪相比它较不油腻、较软也更脆。
Wax: Any of a class of pliable substances, organic compounds of animal, plant, mineral, or synthetic origin, less greasy, harder, and more brittle than fats.
触感轻柔顺畅，不油腻，易于涂抹。
触感轻柔顺畅，不油腻，易于涂抹。
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