"It's a no-brainer."是一个口语表达，意思是某件事情非常简单或显而易见，不需要太多思考或决策。

情景会话1 我与好友Jane度假

Jane: I'm trying to decide between taking a taxi or walking to the restaurant. What do you think? （我在考虑是坐出租车还是步行去餐馆。你怎么想？）

Zoey: Well, the restaurant is just around the corner, and the weather is great. Walking is definitely a no-brainer! （嗯，餐馆就在拐角处，而且天气很好。步行绝对是个毫无疑问的选择！）

情景会话2 好友Vicky想要买包

Vicky: Should I buy this designer handbag or the less expensive one? （我该买这个设计师手袋还是价格更便宜的那个？）

Zoey: It's a no-brainer to invest in the higher-end option. The designer handbag is made of high-quality materials and has a timeless design. （选择高端的那个毫无疑问是一个明智的投资。这个设计师手袋采用了高品质的材料，设计也非常经典。）