centre line

基本解释

A powder-coated grille has a formed peak along the centre line of the grille for additional strength and rigidity.
粉末涂层格栅沿额外强度和刚度格栅中间线形成的高峰期。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
Also notice how the hand has to lead the elbow to get round - this swinging path has momentum and when you enter the water at the front of the stroke your hand will want to cross the centre line.
还有需要注意的是这时手带着肘部时有向中间划动的惯性，这样手部入水时会过身体的中线（交叉）。

Last time the cop claimed that Gonzalo's tyre had touched the centre line as he was driving.
ECONOMIST: They came to America illegally, for the best of reasons