出生于南非的80后黑人脱口秀主持人“崔娃”特雷弗·诺亚（Trevor Noah）终究是昙花一现，欧美人还是习惯喜欢听老白男在电视机里“叨逼叨”……这不，新年伊始，五名深夜秀白男名嘴（从左至右）约翰·奥利弗（John ...

Please explain “keep on top of his finances” in this sentence: He said he was going through a hard time having split up from ...