这个行业门槛太低了，什么人都能做，自然就会复杂。
This industry doorsill is too low, what person can be done, meet naturally complex.
然而，轨道交通行业门槛高，全球只有为数不多的企业在做，要把很多核心的产业链打通，才能真正做出来。
However, the threshold of rail transit industry is so high that only a few companiesaround the world have been in it.
你可以在许多其它的行业中看到相对较低的门槛。
You'll see it in any field with relatively low barriers to entry.
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