The other reason is that Africais a pit of diseases, harsh climates, and to put it frankly, few great civilizations.
另一个原因就是非洲疾病肆虐，气候恶劣，坦白地说，几乎没有文明存在。
youdao
Put frankly, it is not the thing to say.
恕我直说吧，那不是该说的事情。
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