求翻译：基站天线在安装时应该注意其在覆盖区是否会产生较大的阴影，阴影的形成通常是由于基站附近存在较大的阻挡物，如大楼、高山等。安装时应尽量避开阻挡物， 当利用大楼顶面安装定向天线时，必须注意避免大楼的边沿阻挡波束辐射，应尽量靠近大楼边沿安装，这样可以减少或消灭阴影的形成，由于天面的复杂性，当天线必须离大楼边沿较远安装时，天线应尽量架设在离天面较高的地方，此时工程上必须考虑楼面的承载和天线的迎风受力问题。是什么意思？

Base station antenna installation should be noted that the coverage area will produce a larger shadow, the shadow of the formation is usually near a base station, there are large obstacles, such as buildings, mountains. Installation should try to avoid blocking the matter, when the roof surface to i

Base station antennas in the installation, it should be noted that it is in the coverage area will have a big shadow, the shadow is usually the result of a nearby base station there is a major barrier, such as buildings, mountains, and so on. As far as possible should be installed away from obstruct

Base depot antenna when installment should pay attention to it in the cover area whether can have the big shadow, the shadow formation usually is because nearby the base depot has the big impediment, like building, mountain and so on.Installs when should avoid the impediment as far as possible, when

Base station antenna installation should pay attention in the shadow of the covered areas will have a greater, form is usually near the base station of the shadow of a large block, such as buildings, mountains and so on. Installed Shi should as avoid barrier real, dang using building top surface ins