Benzidine staining can be used to get an approximateestimate of "viable" pollen.
花粉的生活力染色测定以联苯胺染色较适宜。
2
Please provide an approximateestimate of the length of the finished book, in words or pages, assuming the average printed page contains around 400 words.
请提供预估一下最终出书的篇幅（字数或页数均可），假设每一页400单词。
3
An experienced editor can estimate by the eye (by his eye) the approximate number of words in an article.