慢速英语:Protecting Migrant Workers Helps Host Countries

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trend – n. the general direction of change, development or action

unique – adj. one of a kind

characterization – n. describing the character or qualities of something or someone

unjustified – adj. not necessarily right, fair or correct

assimilate – v. to become part of another culture or society

underground – n. not official or out in the open, hidden, secret; not legal