Bruce Robeson is exploring the deep mid-water environment the void that lies between the sun-lit surface and the canyon floor.
布鲁斯·罗伯逊正在研究深海水环境，探寻海平面和峡谷底之间的中空地带。
2
By combination with coagulation, sedimentation and biological treatment, the black liquor after treatment could reach the mid-water standard in the paper industry.
配合混凝沉淀及生物处理，处理后的黑液可达到造纸业的中段水标准。
3
At mid-century, an Antwerp financier only slightly exaggerated when he claimed, "One can no more trade without bills of an exchange than sail without water."