誰が中国人で誰が日本人か見た目でなんとなく分かるよって英語でなんて言うの？
東アジア人同士なら見分けがつくのかという西洋人の友人の疑問に答える一言です。
回答
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We can pretty much tell by their appearance who is Chinese and who is Japanese
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We can usually distinguish by looking at them who is Chinese and who is Japanese
「誰が中国人で誰が日本人か見た目でなんとなく分かるよ」＝ We can pretty much tell by their appearance who is Chinese and who is Japanese / We can usually distinguish by looking at them who is Chinese and who is Japanese
ボキャブラリー
pretty much ＝ なんとなく
tell/distinguish ＝ わかる、区別する
by their appearance / by looking at them ＝ 見た目で
イギリス 
