英语语法分析

Because no modern land animals even approach sauropod size, scientists have also lacked a living analogue to use as a guide to possible sauropod behavior.

因为现代陆地动物的体型都比不上蜥脚类动物，科学家们也缺乏一种类似的活物参考以了解蜥脚类动物可能做出的行为。

Until the recent discovery of fossilized sauropod nesting grounds, scientists were thus uncertain whether sauropods laid eggs or gave birth to live young.

因此，直到最近发现蜥脚类恐龙筑巢地的化石之前，科学家们还不能确定蜥脚类动物到底是产卵还是胎生。

The most famous is Brontosaurus, the genus name of the sauropod dinosaur.

最有名的是蜥脚属恐龙——雷龙（Brontosaurus）的那次。