我在学普通话，因为它显然是一门在学习上非常具有挑战性的语言，。
I'm learning Mandarin Chinese because it is apparently a very challenging language to learn.
SSIS提供一个具有挑战性的全人教育，鼓励有上进心，终身学习者，其他文化和价值是谁负责，有意义的参与国际社会。
SSIS offers a challenging holistic education that encourages self-motivated, lifelong learners, who value other cultures and are responsible, meaningful participants in the international community.
SSIS提供一个具有挑战性的全人教育，鼓励有上进心，终身学习者，其他文化和价值是谁负责，有意义的参与国际社会。
SSIS offers a challenging holistic education that encourages self-motivated, lifelong learners, who value other cultures and are responsible, meaningful participants in the international community.
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