Para.17 (2)step up:to increase the amount,speed, etc.增加，提高 e.g.Our trade with foreign countries is stepping up. .He has stepped up his training to prepare for the race. Para.17 ❖ (2) step up: to increase the amount, speed, etc. 增加，提高 ❖ e.g. Our trade with foreign countries is stepping up. ❖ He has stepped up his training to prepare for the race