Nowadays, it is understood that a diet which contains nothing harmful may result in serious disease if certain important elements are missing.
形式主语如今人们知道，如果食物中缺少了某些重要的成分，即使其中不含任何有害的物质，也会引起严重的疾病。
Nowadays, it is understood that a diet which contains nothing harmful may result in serious disease if certain important elements are missing.
形式主语如今人们知道，如果食物中缺少了某些重要的成分，即使其中不含任何有害的物质，也会引起严重的疾病。
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