第壹重
主句：Did you know 妳是否知道
賓語從句：that it's been found in laboratory testing that some types of oilare really bad for us
第二重（嵌套復合句）
主句：it's been found in laboratory testing 這已經在實驗室測試中被發現
形式主語it（指代下面的主語從句）
謂語部分has been found in laboratory testing
主語從句：that some types of oil are really bad for us 有些類型的油類確實對我們有害
參考譯文：妳是否知道有些類的油類確實對我們有害這個事實已經在實驗室檢驗中被證實.