Bixby has now added Mandarin-language support in Malaysia, following it being introduced in China a few months ago.
Prior to this, Bixby could only support US English and Korean. With the new Mandarin-language support, you can use it with selected native apps by Samsung and Bixby Labs and other apps by third-party providers. It's already integrated with Samsung’s Bixby Home, Reminder and Vision.
Tip from Samsung: You can apparently say dă kāi xiàng jī (打开相机) to activate the camera so try it if you have one of the Samsung devices that Bixby supports - the Galaxy S8, S8 Plus and the Note 8.
Now, if only Bixby could rap in Mandarin...