indicator yellow造句

Since most bacteria can use the sugars in preference to peptone, these " uninteresting " bacteria acidify the medium and turn a pH indicator yellow or red.
It also contains lactose, and organisms such as BCC that do not ferment lactose turn the pH indicator yellow, which helps to distinguish it from other organisms that may grow on OFPBL agar, such as " Candida " species, " Pseudomonas fluorescens ", and " Stenotrophomonas " species.
It's difficult to find indicator yellow in a sentence. 用indicator yellow造句挺难的