他们还研究了在巢穴里或巢穴附近发现的那三种恐龙的骨骼化石，以确定它们的性别。
They also examined the fossilized bones of those three types of dinosaurs that were found on or near nests to determine their sex.
他以及其他科学家表示，现在主要有两种替代化石燃料的选择，即用可再生能源产生能量或采用核能。
He and other scientists say there are basically two options to replacing fossil fuels, generating energy with renewables, or embracing nuclear power.
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