A crack tooth can be caused by biting down on something hard.

牙齿开裂可能是由咬下坚硬的东西引起的。

Multiple lines of research have found that biting down on the mouthpiece improves muscular strength.

多项研究发现，咬紧牙套可以增强肌肉力量。

It is biting down on the dinosaur's chest, and has dislodged two of its ribs.

它咬住恐龙的胸部，并咬断了恐龙的两根肋骨。

Back in the tunnel and his own mind, Harry opened his eyes; He had drawn blood biting down on his knuckles in an effort not to shout out.

哈利回到了隧道内自己的身上，张开眼睛，拔出为了不叫出来而已被咬出血的手指。

A positive test results in involuntary contraction of the jaw or biting down hard on the spatula due to the lower threshold for muscle spasm in patients with tetanus.

阳性征为下颌发生不自觉闭合动作，或由于破伤风患者肌肉痉挛的阈值降低而紧紧咬住压舌板。