慢速英语:专家称脊髓灰质炎可能再次在全世界传播

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eradicate –v. to completely remove

remoteness –n. the quality of being far away from other things

immunization –n. the process of giving someone a vaccine to prevent infection

track –v. to follow and observe

dose –n. an amount of a medicine taken at one time

crippled –adj. to be unable to move or walk normally