1·A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized.
雌性储存精子，可以通过受精或不受精来决定每一个卵细胞的性别。
2·They also examined the fossilized bones of those three types of dinosaurs that were found on or near nests to determine their sex.
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。