譬如，在几何学里我们必须假定，一个圆周的圈线是由无限多喝无限小的直线形成的。

Thus in geometry you are told to conceive the circumference of a circle as formed of an infinite number of infinitely small straight lines.

youdao

索铌格提供广泛的线束加工设备，用于对线缆进行切割、剥皮、压接、镀锡、扭线、圈线和收线等加工处理。

Schleuniger offers a wide range of wire processing machines and systems for cutting, stripping, crimping, tinning, twisting, coiling and stacking.

youdao

当然一个低成本但不是相当直接的方法是，夏至时去北极圈旅行，花一晚上的时间(能在热水缸里最好)看地平线以上的太阳圈。

For a cheaper, although not quite as direct, method, journey north of the Arctic circle around the summer solstice and spend a night (ideally in a hot tub) watching the sun circle above the horizon.

youdao