Wind velocity also increase with altitude and may cause serious stress for trees,as is made evident by the deformed shapes at high altitude.
Wind velocity also (with altitude)increase and may cause serious (for trees)stress ,as is made (by the (deformed )+(at high altitude)shapes )evident.
风速(随海拔)增加并且风速造成(对树的)压力，这个作为(可塑的且在高海拔的)形态的)的证明。
as is the case应理解为非限制性定语从句，as为关系代词，代表主句所表达的整个概念。以下例句均出自《英语As的用法研究》：
As has been said before, grammar is not a set of dead rules.从前讲过，语法并不是一套死规则。
As is very natural, man can't live without air.没有空气，人就不能生存，这是十分自然的。
As is often the case, the girl forgot to bring her dictionary.那个女孩忘记了带词典，这是她常有的情况。
As is announced in papers, our country has launched another man-made satellite.报上宣布，我国又发射了一颗人造卫星。
The author was brought up in a small village, as is recounted in some of his stories.这位作者是在一座小村庄长大的，他在自己的一些故事中讲述过这一点。
Which of sentences below best expression the essential information in the highlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.
===============================================================================Because of their deformed shapes at high altitudes,trees are not likely to be seriously harmed by the strong winds typical of those altitudes.
Because of their deformed (at high altitudes)shapes ,trees are not likely to be seriously (by the strong ( typical of those altitudes)winds)harmed .
因为树的可塑（在高海拔的）形态，树好像并不严重（被（高海拔典型的）强风）受损。
------主语是风速不是树
==============================================================================
As altitude increases, the velocity of winds increase, leading to a serious decrease in the number of trees found at high altitudes..
As altitude increases,(of winds)the velocity (leading to (in the number of (found at high altitudes)trees )a serious decrease ) increase,.
随着海拔增长，风速也（造成一个严重（（在高海拔发现的）树的数量）下降式的）增长。
-----没提及树的数量
=============================================================================
The deformed shapes of trees at high altitudes show that wind velocity,which increase with altitude,can cause serious hardship for trees.
The deformed (of (at high altitudes)trees )shapes show that wind velocity,which increase with altitude,can cause serious (for trees)hardship .
这些重塑的（（高海拔的）树的）形态说明（随着海拔增长的）风速能够造成严重的困难。
===============================================================================
Increased wind velocity at high altitudes deforms the shapes of trees, and this may cause serious stress for trees.
Increased wind (at high altitudes)velocity deforms the (of trees)shapes ,and this may cause serious (for trees)stress .
增长的（高海拔的）风速塑造（树的）形态并且这个现象造成（对树的）巨大压力。
------是风速，不是这个现象