Because the extraction procedure is very difficult and usually has a low yield, so chemical synthesis becomes of great importance.
由于它的提取非常困难，产率极低，因此其人工合成就显得非常重要。
Because the extraction procedure is very difficult and usually has a low yield, so chemical synthesis becomes of great importance.
由于它的提取非常困难，产率极低，因此其人工合成就显得非常重要。
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