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。

youdao

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。

youdao

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.

基于空间曲面共轭原理，确定齿轮切齿矢量关系，建立了螺旋锥齿轮的齿面矢量方程。

youdao

When she and Marjorie arrived home from church one Sunday to find the space where the stereo had sat looking as vacant as a missing tooth, Candy had felt a rush of elation.

NEWYORKER: The Visitor