with one gulp
一饮（而尽）
having emptied his glass at a gulp, Roger pulled out a cigar.将杯中的酒一饮而尽后，罗杰抽出一支雪茄。
having emptied his glass at a gulp, Roger pulled out a cigar.
将杯中的酒一饮而尽后，罗杰抽出一支雪茄。