Co-efficient
n. [數] 系數；率；協同因素\\na. 合作的；共同作用的
?? 詞語組成解析
[醫] 鈷(27號元素)
efficient
[i'fi??nt]
adj. 有效率的;（直接）生效的;能干的;（因省錢、省時或省力等而）收效大的;
??? 情景例句
I've got to keep my nose to the grindstone to support my family.
我拼命工作養家。
I'm going to buy five pieces.
我要買五片。
What's the time?
幾點了？