As a resul t, nacre thickness is sometimes just a cosmetic layer t hat can wear thin over time.

所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。

youdao

Didn't want to go to school." Bullying is defined as negative behavior repeated over time against the same person.

VOA: special.2010.04.22

"Running averages only work if you assume your data is isn't changing over time, which is good for floods, but not lightning, " he said.

MSN: News flash: Lightning deaths continue to decline in US

His first task is to try to make sure the reaction that puts out power can be fully reversed, so the battery is efficient and doesn't degrade over time.

FORBES

That means the proportion of people whose primary life motivation is fame isn't getting larger over time, even though opportunities for people to try for their 15 minutes have exploded through the Internet and reality TV shows, Brim said.

CNN: How the 'fame motive' makes you want to be a star