A crawler, device of girth welds testing outside pipeline is developed successfully.成功地研制了管道外检测机械装置—爬行器.The pool is divided into three sections with a crawler lane for beginners.泳池分三部分，有为初学者而设的慢泳道。The Google crawler does...
同时, 可食性包装及天然可分解性塑料的进一步开发和研制,离不开高科技的发展.At the same time, edible packaging and natural the further development and research from high - tech industry.本文介绍了生物分解性纤维所用的树脂 、 生产方法及应用.This paper introduces the resins used, produ...
Conditions for the poor in Los Angeles have not improved.洛杉矶穷人的境况仍未得到改善。She has a poor complexion and pock marks on her forehead.她满面菜色，额头上有些麻子。Rust and flaking paint mean the metalwork is in poor condition.生锈和掉漆说明金属配件损毁严...