feelern.
英 'fiːlə | 美 'filɚ
中文n. [动] 触角；试探；试探者；厚薄规
词根词源
feeler (n.)early 15c., "one who feels," agent noun from feel (v.). Of animal organs, 1660s. Transferred sense of "proposal put forth to observe the reaction it gets" is from 1830. Related: Feelers.
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