那个男孩咧嘴一笑，露出了一口显眼的大牙。

The boy gave a ___toothy smile that showed his big teeth.

孩子露出了一个大大的露齿笑容。

The child gave us a big ___toothy grin.

这把旧剪刀的刀口有些参差不齐，但还能用。

The old scissors still work, though their ___toothy edges are a bit rough.