不落在后面，跟上，及时了解（情况）的英文

keep up with

• 不:    a block of wood
• 落:    fall; drop
• 在:    exist; be living
• 后面:    at the back; in th ...
• 跟上:    keep pace with; ca ...
• 及时:    timely; in time; s ...
• 了解:    understand; compre ...
• 情况:    circumstances; sit ...