Gently slide it into the space between the gum and the tooth until you feel resistance.
接着牙线轻轻地滑到牙齿与牙龈的间隙中直到感觉到阻力。
2
That has not stopped them fighting tooth and claw to hang on to their unused white space.
但这并未阻止其为了保住未用的空白频段，而争得头破血流。
3
Based on the conjugation theory of space curved surface, the vector relation of gear cutting is ensured. Tooth vector equation of bevel gear is established.