I see!; Indeed!; Aha!

That was unexpected. I didn't see that coming.

(chiefly in the negative) so much; so often; so long; particularly; especially

Used when something comes to mind: to recall / Used to express agreement: yeah, of course

ideal

hound / a tool of another person, cat's paw

ideal gas (hypothetical gas)

double happiness, 囍

so, like that, in such a way, such

yes, yeah; it's like that; that's how it is; I see. (interjection to show that the speaker is paying attention)