Costless
a. 没有成本的, 不需花钱的
✅ 同义词
🗣️ 情景例句
I agree, Marilyn.
我同意， Marilyn。
He that dallies with enemy gives him leave to kill him.
把敌人看儿戏，无异于准许敌人杀害自己。
Excuse me for ringing you so late in the evening, but I've only just got home.
对不起，这么晚给你打电话，我刚到家。