短语
中文翻译：落后于
同义词：
['behind in', 'fall behind', 'be lagging behind']
例句：
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1. We were all behind the team's progress, but now we are fallingbehind.
我们所有人都落后于团队的进度，但现在我们正在落后。
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2. The newtechnology is so advanced thatit is hard for us tokeep up with the development.
新技术非常先进，我们很难跟上发展的步伐。
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3. He wasalways behind in his studies, and nowhe is struggling to catch up.
他以前总是学业落后，现在正努力赶上。