音标：['rækt] ；

v. 使痛苦, 使焦虑, 绞尽脑汁( rack的过去式和过去分词 )

imp. & p. p. of Rack

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activity definition

aneupolyploid

Anthithamnion

armor piercing bullet (shell)

atomic linewidth

atomic netplane

awgn(additive white gaussian noise)

balavinskite

bivariate 'student' distribution

boat races

borda