Correct
协力
/ xiélì /
Strokes
Definition
to unite in common effort
Example
As a Verb
combine/join forces (with sb); unite/coordinate efforts; join in common effort; combine strengths; make a concerted effort/attempt
1
Yú
与
tóngshì
同事
xiélì
协力
gōngzuò
工作
work in concert with one's colleagues
2
Xiélì
协力
xíngdòng
行动
concerted action
3
Xiélì
协力
jìngōng
进攻
launch a joint/coordinated assault (on)