Costless
a. 没有成本的, 不需花钱的
✅ 同义词
🗣️ 情景例句
There's a park over there. Let's walk in the park for a while.
那边有个公园。我们去散散步吧！
My sister has been engaged for two months.
我的姐姐订婚有2个月的时间了
What's up, George? the called.
“什么事，乔治？”它叫着。