Translation of "Sinks" in Japanese

Wood floats, but iron sinks.

木は浮くが鉄は沈む。

Now it rises, now it sinks.

浮かんだと思うとまた沈む。

As the moon sinks below the mountains...

‎月が山の向こうに隠れる

That sometimes sinks into the minds of some young people.

時に それが若者の精神に 浸透してしまうと言います

My father's condition seems to improve one moment, but the next moment he sinks again.

父の病状は一喜一憂です。