teammate

I passed the basketball to my teammate, who was in a better position to shoot a three-pointer.

(Chinese) 我把篮球传给了队友，他当时处于更好的三分球投篮位置。

A good teammate is someone who supports others and works toward the common goal of the group.

(Chinese) 一个好的队友是会支持他人并为小组共同目标努力的人。