appearance可数？
一般情况下用法是这样:
指容姿、外观时是用不可数
~a man of noble appearance。 一位容姿高雅的男士
~They are very similar in appearance 它们的外观非常相似
出席、出现用可数
~The appearances of social networks have changed our culture in many ways。
社交网络的出现在很多方面改变了我们的文化
~The president candidates made several appearances on TV。
总统候选人在电视上几次露面
特殊情况尢其是指 表里不一 时，外表也会用上可数
He appears to be happy, but appearances can be deceptive/deceiving。
他似乎很高兴，但是外表可以是有欺骗性/欺骗
Their expensive home created a false appearance of success and happiness
其昂贵的家创造出一个成功和幸福的假象
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