将用钢缆替换磨损的绳索。Steel cable will be used to replace worn ropes.这个男人和他的儿子马克曾沿绳索爬下过这些陡峭的悬崖。The man and his son Mark had abseiled down the sheer cliffs.他皮肤下的筋腱像绳索一样暴突出来。His tendons stood out like rope beneath his skin....
棉纤维的最内层组织叫中腔.The innermost region of cotton is called lumen.光学显微镜还可以用来研究棉纤维的次生层.Light microscopy has also been useful in studies on the secondary wall of the cotton fiber.以棉纤维为原料,合成了一种新型推进剂用含能黏合剂纤维素醚硝酸酯.Cellulose ether n...