Fix grammatical mistakes in this sentence: Therefore, we should appreciate the hard work of scientists in the lab and medical center since it has improved our old age lives in many aspects.
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The first sentence is a bit confusing. The second sentence is a bit more straightforward. The third sentence is a bit more complicated.
The first sentence is a bit more complicated. The second sentence is a bit simpler. The third sentence is a bit more complicated.
The first sentence is a bit more complicated. The second sentence is a bit simpler. The third sentence is a bit more complicated.
The first sentence is a bit more complicated. The second sentence is a bit simpler. The third