Cycads removed from their native habitats—and therefore from insects native to those habitats—are usually infertile.
从原生栖息地移走的苏铁，以及从原生栖息地的昆虫身上移走的苏铁，通常是不育的。
What causes cycads to be in danger?
是什么导致苏铁处于危险之中呢？
The flowers of Cycads come out once a year.
苏铁类植物一年开花一次。
Cycads have become a symbol of luck and health.
苏铁已成为幸运和健康的象征。
Nevertheless, anecdotal reports of wind pollination in cycads cannot be ignored.
然而，一些关于苏铁风媒传粉的传闻也不容忽视。
These slow-growing adult cycads even sell for tens of thousands of dollars each.
这些生长缓慢的成年苏铁每棵甚至都能卖到数万美元。
Experiments show that insects can function as pollinators of cycads, rare, palmlike tropical plants.
实验表明，昆虫能充当苏铁科植物、罕见热带植物、棕榈状热带植物的授粉者。
Recently, South African government has taken some actions to protect cycads from being stolen or traded.
最近，南非政府采取了一些措施来保护苏铁不被偷走或交易。
In South Africa, the situation of cycads is getting terrible, but this has drawn little attention from the public.
在南非，苏铁类植物的处境越来越糟糕，但这几乎没有引起公众的任何注意。
The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds of which are released from some of the larger cones.
苏铁雄球果的结构与花粉的风传播相当一致，花粉云从一些较大的球果中释放出来。
Do not laugh cycads. In order to open a flower, it paid more than other species long effort.
不要嘲笑铁树。为了开一次花，它付出了比别的树种更长久的努力。
They expected to find evidence of well-known Late Cretaceous vegetation such as conifers and cycads.
他们原本期望发现晚白垩世时期著名植物如针叶树和苏铁存在的证据。
There are four widely different living groups : the cycads, ginkgo, conifers, gnetophytes, and several fossil groups.
分为四个不同的类群：苏铁类、银杏类、松柏类、买麻藤类植物以及一些化石类群。
There are 11 genus with about 200 species of cycads in the world, and the chemical constituents and pharmacology of many species have been reported.
苏铁植物分11属共200余种，其中许多种的化学成分和药理作用已陆续有报道。
There are 11 genus with about 200 species of cycads in the world, and the chemical constituents and pharmacology of many species have been reported.
苏铁植物分11属共200余种，其中许多种的化学成分和药理作用已陆续有报道。
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