It looks like an S, and as such we call it a sigmoid curve.

它看起来像S，因此我们称之为S形曲线。

The sigmoid colon, shaped like an S, is at the distal end of the descending colon and leads into the rectum.

形似S的乙状结肠位于降结肠的远端并通直肠。

Extending from the end of the ileum to the anus, it is divided into four parts: cecum, colon, sigmoid colon and rectum.

大肠从回肠末端延伸到肛门，并分为四个部分：盲肠，结肠，乙状结肠和直肠。

So essentially the probability that I'm assigning  to each word for being in the final list will be the value of the sigmoid function  above wherever it sits on the x-axis.

因此，基本上，我分配给每个单词出现在最终列表中的概率将是上面 sigmoid 函位于 x 轴上的值。