ため息, 溜め息, 溜息: sigh

to flutter in the wind

to hesitate, to be undecided, to waver

therefore; for that reason

(Internet slang) recording (a video) or taking (a photo) to save for later

casual talk, usage of an informal speech style

躊躇い: hesitation

炒める: stir-fry / 傷める: cause damage to / 痛める: injure

just in case; to be on the safe side

(chiefly in mathematics, physics) for simplicity; for the sake of simplicity