So, maybe what you have in mind is some sort of doughnut shape 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。
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.
为制作一根海水天线，电流探针（一种电子线圈，尺寸跟形状大致相当于一个大炸面圈）要连接到一副无线电天线端子上。
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《Helenof 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。
the use of optical vortex beams with a doughnut-like shape in the cross-section to form an optical vortex pipeline;
运用了截面为甜甜圈状的涡流光束形成的光涡流通道；
the use of optical vortex beams with a doughnut-like shape in the cross-section to form an optical vortex pipeline;
运用了截面为甜甜圈状的涡流光束形成的光涡流通道；
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