playmate

Since he has no brothers or sisters, he often invites the boy next door over as a playmate.

(Chinese) 因为他没有兄弟姐妹，所以经常请邻居家的小孩过来当玩伴。

The energetic golden retriever proved to be a wonderful playmate for the toddlers in the backyard.

(Chinese) 事实证明，那只精力充沛的金毛寻回犬是后院孩子们的绝佳玩伴。