It's a promise.
就这么定了.
That's OK,then.
那么就这么定了.
That's agreed,then.
那就这么定了.
Sure.Let's call it a deal.
当然.就这么定了.
So we're agreed.
那么我们就这么定了.
Then it's a deal.
那就这样定了.
So that's that.
那就这样定了.
Then that's settled.
好,就这么定了.
Good,that's agreed then.
好的,就这么定了.
Yes,that's settled.
好的,就这么定了.