Collins Chinese Dictionary Plus (3rd edition), 2011:
staple [ˈsteɪpl]
I n
[c]
1 (for fastening paper) 订(訂)书(書)钉(釘) dìngshūdīng [颗 kē]
2
(=food) 主食 zhǔshí
II adj
[+ diet, goods] 基本的 jīběn de
III vt
(=fasten) 用订(訂)书(書)钉(釘)钉(釘) yòng dìngshūdīng dìng
- to be a staple of sth
[product, activity] 为(為)某物的一个(個)主要成分 wéi mǒuwù de yī gè zhǔyào chéngfèn