以下为句子列表：
英文: It make use of sealing device for the hopper to prevent dust emission and material leakage. The dust and cross contamination are efficiently controlled.
中文: 料桶配置密封装置，锁紧可靠，工作时不扬尘，不泄漏，有效的控制了粉尘和交叉污染。
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英文: The main equipment is the bio-safety cabinet (type B2 is better, because it can avoid recycling of nucleic acid cabinet and cross contamination of specimens).
中文: 仪器设备主要应有生物安全柜（最好为B2,可避免提取核酸在柜内反复循环，造成标本间交叉“污染”，出现假阳性结果。
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