appearance 普通用词，着重由总体产生的印象。
look 普通用词，多用复数，可与appearance换用，但较口语化。
face 侧重指容貌。
aspect 书面用词，突出人或事物在某特定时间或地点时的外貌。
参考例句
1. Have the proficient operation ability in the computation aspect and the fast computation skill. 在计算方面具有较熟练的运算能力和较快速的计算技巧。
2. In order to thrive in the future, you must constantly create new ideas for every aspect of your business. 为了将来能够获得成功，你必须不断地在你商业领域的各个方面创造新的理念。
3. In general, in one aspect, the disclosure describes a method of processing content (222) for distribution (264) over a computer network (202). 通常，一方面，公开内容描述了一种处理用于通过计算机网络（202）分发（264）的内容（222）的方法。
英英解释
n.
1. a distinct feature or element in a problem
2. a characteristic to be considered
3. the visual percept of a region
4. the beginning or duration or completion or repetition of the action of a verb
5. the feelings expressed on a person's face
