litmus paper

音标发音

Litmus paper turns red on contact with an acid.
石蕊試紙來試騐這液躰是不是酸性的。
Strong bases that turn litmus paper blue, they react with acids to yield salts, are caustic, and in concentrated form corrode tissues.
它們與酸作用成爲中性鹽；它們是苛性的，其濃縮物可腐蝕有機組織。
In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a Base.
它的水溶液，或者做成石蕊紙後，是最古老和最常用的指示劑，可以指示一種物質是酸還是堿。

When the government waves its litmus paper in their face, the Lib Dems retort that if the prime minister is serious about his project, he needs to understand that coalition politics cannot work unless—on some issues, at some times—the smaller party is allowed to win.
ECONOMIST: The Scottish play