美 [læɡ bɪˈhaɪnd]
落后：指在发展、进步等方面比其他人或事物慢。
滞后：指在时间上或进程上比预期或其他事物慢。
追不上，跟不上：指无法赶上其他人或事物的速度或进展。
比同龄人差：指在某方面的能力或成就上不如同龄人。
... kick in，开始；闯进来 lag behind，滞后 sprout，萌芽；迅速成长 ...
... Lag Behind：落在后面 Benchmark：基准点，衡量标准 Ordeal：严峻的考验 ...
... press for 再三请求，紧急要求 lag behind 掉队 exert oneself 努力 ...
... life expectancy平均寿命 lag behind落后于 compare with (把…)与…相比 ...
落后；拖欠
Western banks still lag behind financial institutions in most other regions of the country.
西部地区的银行仍然落后于这个国家其他大部分地区的金融机构。
As a consequence, they lag behind other disciplines.
因此，他们落后于其他学科。
In the developed world, women lag behind men in pay and political power.
在发达国家，女性在薪酬和政治权力方面落后于男性。
Economists have long assumed that job creation would lag behind overall improvement of economic conditions in the United States.
VOA : standard.2010.05.20
"The same problems exist in developing countries, but the institutional development of regulatory agencies lag behind.
VOA : standard.2010.02.22
Sikora says British authorities lag behind other European nations in making cancer drugs available.
VOA : standard.2009.09.24
Smithfield's shares rebounded from the recessionary lows, but continued to lag behind its rivals' stock prices.
Big department stores and specialty clothiers, both expected to increase sales about 4%, will lag behind.
We lag behind other nations in the quality of our math and science education.