active a.活跃的;积极的 activity n.活动;活力;行动 actress n.女演员 actually ad.实际上;竟然 acute a.尖的,锐的;敏锐的 adapt vt.使适应;改编 add vt.添加,附加,掺加 addition n.加,加法;附加物 additional a.附加的,追加的 address n.地址;演说;谈吐 adequate a.足够的;可以胜任的 adjective n.形...
But more commonly today it is used as anoun to refer to a “synthetic materialmade from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be moulded into shape while soft, and then set into a rigid or slightly elastic form:Oxford. or Any of various or...