His remark was right on the button.他的话完全准确.He soaked Haas on the button.他猛击哈斯的下巴.I stood at his left, my finger on the button.我站在他左边, 手指放在按钮上....

在下巴尖上，准确地...

on the button的音标：on the button的英式发音音标为：[ɔn ðə 'bʌtən]on the button的美式发音音标为：[ɑn ði 'bʌtn]...