Pick up the tab - pay the bill, pick up the bill
Many Chinese people are willing to pick up the tab when they invite friends to restaurants. 許多中國人在餐館請客時比較願意買單。
be willing to 願意做....
Mr. Wang can well afford to pick up the tab. 王先生有足夠的能力支付賬單。
My father picked up the whole tab for the research. 我父親承擔了所有的研究費用。