keep on doing sth持续做某事keep up 保持，沿袭后接名词或代词，接代词时放在up前
keep up英 [ ki:p ʌp ]vi. 不减弱， （天气）持续不变;保持;保养;（使）不倒下;保持不衰退;keep on英 [ ki:p ɔn ]继续雇用;继续前进;继续穿着;重复;
