For ease of handling, installation, can provide smaller, lighter frame in order to reduce weight.

为了便于搬运、安装，可以提供较小，较轻的外框以降低重量。

youdao

For ease of handling, installation, can provide smaller, lighter frame in order to reduce weight.

为了便于搬运、安装，可以提供较小，较轻的外框以降低重量。

youdao