They then crossed the whole tongue and jumped over three rows of teeth.
然后，它们穿过整个舌头，跳过三排牙齿。
2
The first thing I do in the morning is to brush my teeth and sharpen my tongue.
我在早上做的头一件事，是刷我的牙、磨我的舌。
3
If you gradually move your tongue forward towards the th-sound, stopping halfway, your tongue will be behind your teeth, and the pitch will get higher.