1. When they managed to beg some from the local farmers, they had to filter it through linen to get rid of the filth it contained.
    当他们设法从当地的农民那里乞求到一些水时，他们不得不用亚麻布来过滤掉里面的污物。

2. I took this picture with a red filter.
    这张照片我是用红色滤光镜拍摄的.