1从热带雨林到寒带针叶林,从潮湿的海滩边到干热的高岗上,我们到处都能发现兰花的踪影。兰花是如何走遍天涯的呢?2兰花的种子细小,大多比头发丝还轻微。把它放大,我们能发现种子内部还有许多充满空气的空腔,能进一步减轻种子的重量。这样,凭借身子的轻巧,种子一出世就可以随风(piāo)往他乡。另外,种子的外表还排列了一层致密的细胞,有一定的防水功能,可以防止水分的渗入,徒增自身重量。这样,种子还可以随 1 From the rainforest to the frigid coniferous forest, from the wet beach to the hot, dry Konggang, we see traces of orchids everywhere. Orchid is how to travel around the world? 2 Orchid seeds are small, mostly smaller than the hair. To enlarge it, we can see that there are many air-filled cavities inside the seeds that further reduce the weight of the seeds. In this way, by virtue of its body weight, the seed can be pirated to other countries as soon as it is born. In addition, the seed’s appearance is also arranged a dense layer of cells, a certain waterproof function, can prevent the infiltration of water, only by their own weight. In this way, the seeds can follow