Instead, from the gut, bacteria get to the rectum, anus and eventually colonizes the perineum, becoming part of the normal flora.

相反，细菌到达直、肛门，最终定居于会阴，成正常菌群的一部分。

Meanwhile, signals are sent to the brainstem and thalamus, and when these decide the right moment has come, they allow the external anal sphincter to relax - and feces goes, hopefully, into the toilet bowl.

直发出的信号同时也发送到了脑干和丘脑；它们认定“时机成熟”时，便会下达指令使肛门外括约肌松弛；便就能——不出意外的话——顺利排入马桶。

The rectum serves as a reservoir for feces. It terminates in the lower opening of the gastrointestinal tract, the anus, which is the external opening through which feces are released from the body.

直便的容器，终止于胃的下部开口，即肛门，肛门是便从身体排出的外部开口。

The large intestine — consisting of the colon, rectum, and anus — is relatively short, at about one and half meters, and it provides a nice little frame for the small intestine, here at the end of the alimentary canal.

大——结、直和肛门组成——相对较短，大约 1.5 米，它小提供了一个漂亮的小框架，在消化的末端。