单词：sample collector
sample collector的用法和样例：
例句
- As the sampler is dragged along the bed, it collects a sample from the top layer of bed material.取样器沿河底拖动，收取表层河床质。
单词：sample collector 相关文章
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圣诞特辑
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VOA标准英语2008年（三月）
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趣味英语
Tax Collector 收税员 Little Johnny was playing with his father's wallet when he accidentally swallowed a quarter. He went crying to his mom, choking on the quarter. 小约翰尼在玩爸爸的钱包时，不小心吞下了一枚25分硬币。硬币卡
英语小达人
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实用英语