This idiom has two opposite meanings: One means people advance bravely despite hardships (commendatory meaning).
这则成语有两个相反的意思：一个是指不畏困难勇猛向前（褒义）；
Excepting its commendatory senses, tortoise has a derogatory sense. As one man running into difficulties, he resemble shrinking however head tortoise.
除了以上祥瑞之意，龟也有贬义，比如，表示一个人懦弱无能，遇到危险就退缩。
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