So, maybe what you have in mind is some sort of doughnutshape like this that curves on itself, and maybe comes back.
有可能你想到的是一类这样环状物，它自身有这种曲线，也有可能绕回来。
2
To make a seawater antenna, the current probe (an electrical coil roughly the size and shape of a large doughnut) is attached to a radio’s antenna jack.
Hughes, a British television host and popular historian known for her book on Helen of Troy, does it by concentrating on the shape of the doughnut around the hole.
作家Bettany Hughes是英国电视节目主持人，因为写书《Helen of Troy（特洛伊的海伦）》而为人们所熟知，成为流行历史学家。 她的这本新书就要集中描写“甜甜圈”中的那个黑洞。