The painting started to drop down in its frame and was shredded by some blades hidden in the bottom of the frame.

那幅画从框中脱落掉下来，被藏在画框底部的刀片切成了碎片。

youdao

Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.

对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。

youdao

He said by the end of the year, there was a 6 percent drop in the consumption of such drinks.

他说，到今年年底，这类饮料的消费量下降了6% 。

youdao

Just last week,the Commerce Department reported an unexpected drop in December in the number of housing starts by builders.

VOA: special.2011.01.24

He points to a big drop in the number of planned job cuts announced by employers over the past six months.

VOA: special.2010.07.02

Another doctor believes that Ernest Shackletons vision was caused by a drop in blood sugar.

VOA: special.2010.02.24

The statistics may show a drop in crime across the country in the past five years, including a drop in murders by gun-wielding teenagers, but the fact is that each year more than 2, 000 Americans aged 14-17 use a gun to kill someone.

ECONOMIST: The lesson nobody learns

Microprocessors, however, double their performance every 12 to 18 months and drop in cost by 30% a year.

FORBES: Maybe Not So Crazy

Over the last four quarters, the company saw a year-over-year drop in revenue by an average of 3.9%.

FORBES: Earnings Preview: Loews