B: Thanks, that would be terrific. I planned on walking, but I didn't know it was going to rain so hard tonight. You're a lifesaver!
B: Thanks, that would be terrific. I planned on walking, but I didn't know it was going to rain so hard tonight. You're a lifesaver!
（谢谢，真是太好了。我本打算走回去，但没想到今晚会下那么大的雨。你真是雪中送炭啊。）