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他知道，即便他讓一只狗懷孕，其后代（如果能存活的話）將面臨其他克隆動物在出生時所出現的問題：畸形發育，如肺部和心臟不完全發育以及體重問題。
六級詞匯講解:
本句的主干是He knows that...。nows后面的內容均為that引導的賓語從句；該從句中包含even if引導的讓步狀語從句；should they survive為插入語，是虛擬語氣，因省略了if而引起倒裝，過去分詞短語shown at birth by other cloned animals作定語修飾problems，冒號后的內容對其進行補充說明。
even though和even if均可用于引導讓步狀語從句，但有細微區別。
even if意為"即使；盡管；縱然；就算"，引導的從句往往是假設性的，有時還可用于虛擬語氣；此時even if與單獨使用的if比較接近。如：
Even if many difficulties remain，we can overcome them.
即使有再多的困難，我們也能克服。
Even if it should snow tomorrow，they will go jogging.
縱使明天下雪，他們也要去跑步。
I would have married him even if he had been penniless.=1 would have married him ifhe had been penniless.
即使他身無分文，我也會嫁給他。
( Even) though it is twenty years old，the house is still in good condition.
雖然這棟房子已經有20年房齡了，但它的狀況仍舊良好。
I don't want to eat anything，(even) though I am hungry.
盡管我很餓，但我還是不想吃任何東西。
( Even) though Nick was tired, he helped me repair my computer.
盡管尼克累了，但他還是幫我修了電腦。
Even though/if you do not like your job，you must do it．
即使不喜歡你的工作，你也得做下去。
