writing(s)
1.a writing用来指“一篇文章”或“一本著作”很不普通，但往往指“一个文件”。复数形式指“（某人的）著作”。例如：His writings have been published in five volumes.
2.writing用作“笔迹”解总是用单数形式。例如：His writing is not clear enough.
3.at the time of writing作“当我在写这篇文章（或这本书）写到这里的时刻”。例如：At the time of writing, birds are singing outside the window. 和At the time of writing, news of technical transformation of agriculture keeps coming in.
