The Bokeo Nature Reserve was created to protect its population of the black-cheeked gibbon, rediscovered in 1997, which waspreviously thought to be extinct.
塞尔维亚部队重新取得科索沃主要道路的控制权,并占据了一些以前被认为是科军据点的城镇。
The Serb army regained control of the principal roads of Kosovo and captured a number of towns previously viewed as KLA strongholds.
Overall, the intensification of the armed conflict in the south, and its expansion into areas previously considered stable, made 2009 the worst year for civilian fatalities since the fall of the Taliban regime in 2001.
Today, the myxozoans, previously thought to be multicellular protozoans, are considered animals by most scientists, though their status has not officially changed.
A new drug discovery system allows scientists to specifically target members of an important family of enzymes, called phosphatases, which were previously considered mostly'undruggable'.
Today, the myxozoans, previously thought to be multicellular protozoans, are considered animals by many scientists, though their status has not officially changed.
The situation in the southern region remains of great concern, while attacks have further spread to northern provinces previously considered relatively safe, such as Takhar and Badakhshan.
这在以前被认为是人类特有的。
The capability was previously believed to be specific to humans.
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