"many of them can not catch up with the others."means many of them ________behind the other________.

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"many of them can not catch up with the others."means many of them ________behind the other________.
"many of them can not catch up with the others."means many of them ________behind the other________.

"many of them can not catch up with the others."means many of them ________behind the other________.
fall,students
fall behind 落后于.
catch up with .追上;赶上

fall,students