The Permian event has attracted much less attention than other mass extinctions because mostly unfamiliar species perished at that time.

二叠纪大灭绝事件比其他大灭绝事件受到的关注要少得多，因为那时灭绝的大多是我们不熟悉的物种。

youdao

Supporters of home education claim that it is less expensive and far more efficient than mass public education.

家庭教育的支持者声称，家庭教育比大众公共教育成本更低，效率更高。

youdao

Data has since revealed that all mass strandings around Australia occur on gently sloping sandy beaches, some with inclines of less than 0.5%.

此后的数据显示，澳大利亚周围所有的大规模搁浅都发生在平缓倾斜的沙质海滩上，有些海滩的倾斜度小于0.5%。

youdao

Depending on its initial mass, it might collapse to a compact hot star known as a white dwarf (when the star's mass is less than 1.4 times the mass of our sun) or to a neutron star (for stars 1.4 to about three times the mass of our sun) or to a black hole (for stars more massive than three times the mass of our sun).

CNN: Why gamma-ray burst shocked scientists

The craft is still in the developmental stages, though Korean officials claim it'll be ready for primetime in March 2012, with mass production less than three years away.

ENGADGET: South Korea creates speedy new UAV, gives it VTOL capabilities to boot

In the future, there will be less mass marketing, mass media and mass distribution.

FORBES: The Future Is Bright For Niches