Be in your element
是指一個人在一個很適合他的地方，感覺很自在、很快樂、很舒服。
Bisou is always so in her element when she plays in the bedroom
(比朱在臥室玩的時候總是特別自在)
那也會有相對的out of your element
Bisou: I always feel out of element when mom takes us out to a new place
(比朱說:媽帶我去陌生地方的時候我總是覺得很不適應)
