Waiting for the aerial acrobats to land might make things easier. 等待这些空中杂技演员降落 可能会降低抓捕难度
dragonflies in flight can be just too hard to catch. 飞行中的蜻蜓仍然很难捕获
The evolution from fin to limb took millions of years. 从鳍到肢的进化用了数百万年
The race was on to colonize this new world. 争夺新世界的竞赛已经开始
allowed vertebrates to leave the water and explore the land. 使脊椎动物能够离开水体并探索陆地
but they're strong enough to support their body weight... 而且足够强壮 能够支撑它们的体重
they are different to those of other fish. 叶鳍与其他鱼的鳍不同