His face remained impassive, so strong was his self - control .他依然是面无表情, 自控 能力是如此之强.Her face remained impassive,studying the Belgian as he completed the form.她不动声色,仔细观察正在填写表格的那个比利时人。Her face remained impassive, studying ...
土壤的采样使用芯形采样器.Soil is sampled with a core sampler.为了保持样品沉积物的层次结构, 就要用空心铁管采样器.To take samples that retain the larger structure of the sediment, a core sampler is used.我国降水自动采样器的现状 、 存在的问题和今后的发展趋势.The status, constraints an...