27. "Celebrate!"commanded the ads for the arthritis drug Celebrex,before we found out it could increase the risk of heart attacks.

【分析】多重復(fù)合句。主句為the ads for the arthritis drug Celebrex，謂語(yǔ)為commanded，賓語(yǔ)為"Celebrate!"。Before引導(dǎo)時(shí)間狀語(yǔ)從句，其中又包含省略that的從句it could increase the risk of heart attacks作found out的賓語(yǔ)。

28. But what we forget-what our economy depends on us forgetting-is that happiness is more than pleasure without pain.

【分析】復(fù)合句。what引導(dǎo)主語(yǔ)從句作句子主語(yǔ)，破折號(hào)之間的what從句是對(duì)前面主語(yǔ)從句的補(bǔ)充；is是系動(dòng)詞；that引導(dǎo)表語(yǔ)從句，其中more than意為“不僅僅”。
【譯文】但是我們所忘記的——我們的經(jīng)濟(jì)指望我們忘記的——是幸福遠(yuǎn)不止是沒(méi)有痛苦的快樂(lè)。