can you tell Tom (from) his twin brother?I can tell (by) their smiles为什么这两个空要一个填from一个填by呢?

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can you tell Tom (from) his twin brother?I can tell (by) their smiles为什么这两个空要一个填from一个填by呢?

can you tell Tom (from) his twin brother?I can tell (by) their smiles为什么这两个空要一个填from一个填by呢?
can you tell Tom (from) his twin brother?I can tell (by) their smiles
为什么这两个空要一个填from一个填by呢?

can you tell Tom (from) his twin brother?I can tell (by) their smiles为什么这两个空要一个填from一个填by呢?
tell A from B
从B中分辨出A来
tell by…
通过…方式分辨

因为tell A from B意思是辨别A和B;而tell...by...的意思是通过什么方式辨别什么