the two sisters look very alike.They are difficult to

tell
apart
后面不能直接接人或者物
可以用
tell
sb
apart
from
sb
举个例子
1'
He
can
tell
the
Tom
from
the
crowd（他能从人群中分辨出Tom）
2'
It's
hard
to
tell
the
twin
sister
apart
(把双胞胎姐妹区分开是困难地）

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