Excuse me, may I come in?

It is rumored that he is a member of a secret society.

Long time no see, have you been well?

Please be sure to attend tomorrow's briefing.

He sent a message using a straight key.

There are no aspirated consonants in Japanese.

An aspirated consonant is a sound that is pronounced with a strong exhalation.

Please ensure the safety around you when using fire at the camp.

He is behaving like an idiot.

Chlorine detonating gas is very dangerous, and it requires careful handling.