付帐
to pick up the bill = to foot the bill 付帐
to be on sb. = to be one’s dollar (buck) 由某人请客
to take care of the bill 请客
to treat sb. 请某人的客
to split the bill 各付各的
to split the expense 各付各的
to go fifty fifty 各付各的
to share the expense 各付各的
