托福閱讀長(zhǎng)難句:懷孕魚(yú)龍群

　　But these factors do not account for the interesting question of how there came to be such a concentration of pregnant ichthyosaurs in a particular place very close to their time of giving birth.

　　(Of結(jié)構(gòu)作定語(yǔ)：of how there came to be such a concentration of pregnant ichthyosaurs…)

　　翻譯：但這些因素并不能解釋這個(gè)有趣的問(wèn)題：為何在一個(gè)特定的地點(diǎn)會(huì)如此集中地出現(xiàn)即將臨產(chǎn)的懷孕魚(yú)龍群。

　　分句1： But these factors do not account for the interesting question

　　分句2： of how there came to be such a concentration of pregnant ichthyosaurs in a particular place very close to their time of giving birth

　　分句1中嵌套著分句2.

　　分句2是of結(jié)構(gòu)作后置定語(yǔ)修飾說(shuō)明question的內(nèi)容。