How big is Psittacosaurus?
1.995 米!
A small, parrot-beaked ceratopsian dinosaur from the Early Cretaceous (approximately 125–100 million years ago). It measured about 6.5 feet (2 meters) in length and weighed around 44 pounds (20 kilograms). Known for its distinctive short beak, similar to a parrot’s, Psittacosaurus was a herbivore, feeding on tough vegetation. Some species had long filament-like structures on their tails, which might have been used for display.
人类
假设你是人类, 我也是人类! 你知道我们的同类有超过 70 亿个吗? 超多的. 事实上, 如果 你一秒遇见一个人, 大概要花上两百年才能遇见全部人类! 最好现在就动身囉!
Rhamphorhynchus
A genus of long-tailed pterosaurs from the Late Jurassic (about 150 million years ago). With a wingspan of approximately 3–6 feet (1–2 meters), Rhamphorhynchus had a lightweight body, long jaws with sharp teeth, and a distinctive diamond-shaped vane at the end of its tail. It likely fed on fish, using its long teeth to snatch prey from the water while in flight.
FM 无线电波长
FM 代表频率调变, 简称调频, 是藉由载波的频率变化来表示讯号的调变方式.