speechless

无言以对

(wúyán yǐduì)

A: I came up with a new way to lose weight yesterday. Not only do you not have to suffer through exercise or from not eating, it's actually pretty pleasant.

我昨天研究出一套新型的减肥方法,不仅不用辛苦的运动和节食,还很享受呢。

(wǒ zuótiān yánjiū chū yítào xīnxínɡ de jiǎnféi fānɡfǎ, bùjǐn búyònɡ xīnkǔ de yùndònɡ hé jiéshí, hái hěn xiǎnɡshòu ne.)

B: Okay, let me hear it. If it's good I'll give it a try.

说来听听,好的话我也尝试一下。

(shuōlái tīnɡtīnɡ, hǎo de huà wǒ yě chánɡshì yíxià.)

A: It's like this. The more you eat, the more energy you need to digest the food. So in this way, the more you eat, the more weight you will lose! From now on, you can eat without any worries!

你看,你吃得越多,越需要更多的能量去消化食物,这样吃得越多越能促进你减肥啊！以后就可以放心地吃了！

(nǐkàn, nǐ chī de yuèduō, yuè xūyào ɡènɡduō de nénɡliànɡ qù xiāohuà shíwù, zhèyànɡ chī de yuèduō yuènénɡ cùjìn nǐ jiǎnféi a! yǐhòu jiù kěyǐ fànɡxīn de chī le!)

B: This theory really has left me speechless.

你这套理论真是让我无言以对啊！

(nǐ zhètào lǐlùn zhēnshì rànɡwǒ wúyán yǐduì a!)