The external anal sphincter plays a crucial role in helping us control defecation.

The external urethral sphincter is an important muscle for controlling the excretion of urine.

The internal urethral sphincter plays a crucial role in controlling the flow of urine.

He was diagnosed with bipolar disorder.

He is receiving treatment for obsessive-compulsive disorder.

I will participate in an obstacle race this weekend.

He tried to solve the problem all day long.

One side of the park was covered with beautiful flowers.

Let's finish this job for now and then move on to the next.

He learned the basics of Japanese.