[cons_smooth] Translation

[longye-tian]

Hi all @mmcky @HumphreyYang @SylviaZhaooo ,

I have translated the lecture cons_smooth.md and put the translated version in the lecture folder.

Best,
Longye

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🚀 Deployed on https://66f3ee88bca98720a34398d3--playful-platypus-17d3bb.netlify.app

[mmcky]

@longye-tian the build is reporting the following warnings

/home/runner/work/lecture-intro.zh-cn/lecture-intro.zh-cn/lectures/cons_smooth.md:61: WARNING: equation not found: eq:a_t
/home/runner/work/lecture-intro.zh-cn/lecture-intro.zh-cn/lectures/cons_smooth.md:71: WARNING: equation not found: eq:a_t
/home/runner/work/lecture-intro.zh-cn/lecture-intro.zh-cn/lectures/cons_smooth.md:132: WARNING: equation not found: eq:a_t
/home/runner/work/lecture-intro.zh-cn/lecture-intro.zh-cn/lectures/cons_smooth.md:138: WARNING: equation not found: eq:a_t
/home/runner/work/lecture-intro.zh-cn/lecture-intro.zh-cn/lectures/cons_smooth.md:188: WARNING: equation not found: eq:a_t