keep track of 跟上…的进展；保持与…的联系；看清；听清；记录；计算 read the newspapers to keep track of current events 读报以了解时事 keep track of each other 保持相互联系 dive beneath the clouds to keep track of the mountain slopes(飞机)俯冲到云层下面以看清山坡 keep track of one's activities with paper and pencil 用纸和铅笔记下自己的活动情况