Well, if you know English, Spanish is (fairly) easy to learn. Basically, most people who had learned a few years of high school Spanish should be able to read most Spanish articles and get the gist of it without much problem. Communicating (ie speaking/writing), however, is another story.
As for Chinese.....well its really hard for anyone who hasn't learned an "Oriental" language already (something like Korean/Japanese) since it really has no resemblance towards Western languages (like the prominent use of phonic spellings as well as the written one)
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