To lag is to be behind in time, distance, or ability. The preposition “behind” is often used with the word “lag.”
“lag”是指在时间、距离或者能力上落后,常与介词“behind”连用。
If you don’t want to lag behind in school, you have to study.
如果你不想在学校(成绩)落后,你就必须学习。
Carla is lagging behind in school because she didn’t study.
卡拉在学校(成绩)落后是因为她不学习。
Orb lagged way behind all the other horses at the beginning of the race, but she pulled into first place by the end.
奥尔布在比赛的一开始落后于其他马匹,但是在最后关头它跑进了第一名。
Try not to lag behind everyone else.
努力不要落后于人。
Don’t lag behind. You don’t want to get lost.
别落在后面。你不会想迷路吧~
I feel like I’m lagging today.
我感觉自己今天落后了。
 
The word “lag” can also be used as a noun:
“lag”可以用作名词,意为“落后”“滞后”。
Housing prices in the United States have put a lag on the economy.
美国房价使得其经济滞后。
Natalie says she has jet lag* after a long flight from Hong Kong.
娜塔莉说,在去香港的飞机上坐了这么久,她需要倒时差。
 
The word “lagging” is an adjective:
“lagging”则是形容词,指“落后的”。
The rate of unemployment is a lagging indicator for the U.S. economy. People lose jobs after a recession begins, and they are able to find jobs after a recession ends.
失业率是美国经济落后的指示器。经济萧条开始后,人们失去工作,而在经济萧条结束后他们是有能力找到工作的。
 
* Note: Jet lag is a feeling of fatigue and disorientation that a person gets when traveling a long distance by airplane within a short amount of time. The body hasn’t had a chance to catch up with the daily rhythms of a new location.
注意:“jet lag”是指人在长距离飞行之后短时间内感受到的疲倦和迷茫,因为身体还没来得及适应新地点的日常节奏,也就是俗称的“时差反应”。

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