清洁牙缝用的纱线(牙线)

The full title of the U.K. is the United Kingdom of （）and （）

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新的和清洁的状态（new and clean condition）

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可用于清洁“牙缝”的牙刷是（）

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饭店清洁人员用的橡胶制围裙

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public and private colleges and universities and community colleges offer（）.

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零售用丝纱线,绢纺纱线;蚕胶丝

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（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.

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The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.

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Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.

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