Plaque - Plaque appears as a soft, gooey substance that sticks to the teeth a bit like jam sticks to a spoon.

菌斑—菌斑表现为一种软的，粘性物质贴在牙齿上，就想粘在汤勺上的果酱。

youdao

Continue to cook for about 30 minutes, stirring frequently with a wooden spoon, until the puree has reduced and thickened considerably to the consistency of jam and reached setting point.

继续煮大约30分钟，用木质汤匙不停搅拌，直到果浆变浓稠，成为酱状，并且可以凝固。

youdao

Plaque attaches to teeth like jam sticks to a spoon. It can't be totally removed by rinsing, but a light brushing will do the trick.

菌斑粘在牙齿上就想汤勺上的果酱，轻轻刷足以去除。

youdao

When the jam is ready, use a stainless-steel spoon to skim any remaining foam from the surface of the jam.

WSJ: Gourmet Spreads