1. These curtains are lightproof, so no sunlight can enter the room.
这些窗帘是防光的，所以没有阳光能进入房间。
2. The lightproof packaging of the film ensures that it won't get exposed to light and remain in good condition.
这种胶卷的防光包装确保它不会暴露在光线下并保持良好的状态。