developing

Developing film in a darkroom is a delicate process.

用法提示：这里的 developing 是动名词，作主语，意为“冲洗（胶片）”。

I bought a new set of chemicals for developing black-and-white photos.

用法提示：developing 作介词 for 的宾语，表示“显影、冲洗”这个行为。

The developing of these old negatives took the photographer most of the day.

用法提示：developing 是名词，在 the ... of 结构中表示“显影、冲洗”。