因为用免提通话会让你的声音失真，christina听不懂.翻译

Christina couldn't get what you said because of distortion when you use the phone in hands-free mode.

Because you are using the wireless phone.Your voice has been changed.I can't hear clear (我把听不懂改为听不清但是你一定要听不懂的就是）
Because you are using the wireless phone.Your voice has been changed.I don't understand.

Using hands-free device during a phone conversation will somehow deteriorates voice quality, which is why Christina couldn't get what you said.