It's providing a means of deciding where the gum has decayed.

它作为一种手段帮助诊断牙龈炎。

The newspapers particularly might have deteriorated, decayed or decomposed over time.

尤其是里面的报纸可能已经被腐蚀，或者随着时间自身腐烂降解了。

But like a garden, peace had to be nurtured and maintained, otherwise it decayed.

但就像花园一样，平静需要呵护和维护，否则它就会腐朽。

The three voices passed on, and decayed and died out upon her ear.

三个人的说话声越去越远，变得低微，最后就再也听不见了。

The decayed officer, by degrees, came up alongside his fellow-wayfarer, and wished him good evening.

衰老的海军军官走上前去，来到赶车的身旁，向他道晚上好。

For example, peatlands are turf areas consisting of partially decayed vegetation and other organic matter.

比如泥炭地是由于部分腐烂植被及其他有机物组成的植草区域。

It lies high upon the hill, between the large oak-trees, one of which is half decayed.

它高高地立在一座山丘上，在一丛栎树的中间——其中有一株已经半死了。

Mary-Ann smiled. Notwithstanding her black decayed teeth there was in her smile something sweet and touching.

玛丽—安笑了。 尽管她有一口黑蛀牙，但是她的笑容还是显得很甜美动人。

" O no, " she said, intractably moving to the other side of the decayed fire.

“咳，不要这样，”游苔莎说，不依不从地朝快要熄灭的篝火那一边走去。

Under the influence of the gravitational force of a black hole, the binary system of stars decayed.

在黑洞引力的影响下，双星系统衰变。