如果玻璃保持足够的温度，它就会在熔化的锡中流动，直到顶部表面也变得平整、水平，与底部表面完全平行。
If the glass were kept hot enough, it would flow over the molten tin until the top surface was also flat, horizontal and perfectly parallel to the bottom surface.
外立面的矩形虽然不完全平行，面向东南和西北。
The facades of its 2 rectangular sections, though not exactly parallel, face broadly south-east and north-west.
除非完全平行或垂直于阀体，或者不要在任何位置用手调整管接螺母。
Do not adjust the union nut with the handle in any position other than fully parallel or perpendicular to the body.
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