お皿 (osara)

鶴(つる)は寿命が長い. Cranes live to a great age.彼が帽子を脱いだ時つるつるにはげているのに気がついた. When he took off his hat, I noticed that he was completely bald.お皿の表面のようにつるつるで、みんなの頭よりも高い壁でした。

It was smooth, like the surface of a dish, and higher than their heads.