He always acts conspicuously, so the proverb 'The nail that sticks out gets hammered down' fits him perfectly.

He always acts conspicuously, which reminds me of the proverb, 'The nail that sticks out gets hammered down.'

He is undergoing training for extravehicular activity.

He engaged in an extravehicular activity from the spaceship.

He is a foreigner, but he can speak Japanese fluently.

I have been to Outer Mongolia.

Coitus interruptus is one method of contraception, but it is not completely reliable.

This book explains in detail about the use of foreign words.

This sentence contains kanji not approved for regular use.

This sentence contains non-Jōyō kanji.