The preparation of diphenyl oxalate(DPO) by transesterification of dimethyl oxalate(DMO) with phenol over TS 1 catalyst(2 5%Ti) has been investigated as function of calcination temperature of the catalyst and reaction time.
研究了以 TS-1分子筛为催化剂 ,苯酚和草酸二甲酯酯交换合成草酸二苯酯反应。
the spotted owl is a threatened species, not yet an endangered one.
花斑猫头鹰是一个受威胁的物种，还不是一个濒临灭绝的物种。
a tribe threatened by/with extinction
受到绝种威胁的部落.
A review on the IUCN draft of threatened categories of biological species
评世界保护联盟新的物种受威胁分类系统草案
Plant species are not the only forms of life threatened with extinction in the rainforest.
各种植物在热带雨林中并不是受到灭种威胁的唯一的生物。
Endangered Plants of Zhejiang Province Enlisted in China Species Red List;
列入《中国物种红色名录(第一卷):红色名录》的浙江受威胁植物
small chimpanzee of swamp forests in Zaire; a threatened species.
扎伊尔的潮湿森林中小黑猩猩；一个受到威胁的物种。
Wild life is under threat everywhere.
野生动物到处受到 (灭绝的) 威胁。
The strategy ensures the existence of the population in those years when the survival of adults is in jeopardy for some reason or other, e.g., due to lack of food.
在由于某种原因如缺乏食物等而使成虫生存受到威胁的年份里，这种策略使种群仍能保存下来。
a forest imperiled by acid rain;
受酸雨威胁的森林；
person socially at risk
社会处境受到威胁的人
Our dominance of the market is seriously threatened by this new product.
我们在市场上的优势必受到这种新产品的威胁。
a threat or the act of threatening.
一个威胁或一种威胁的行为。
The appearance of the red tide has brought threat to the halo bios' existence.
赤潮的出现使海洋生物的生存受到了威胁。
The continent's wildlife is threatened by the destruction of forests, hunting, the presence of non-native species,
非洲大陆的野生动物正在受到威胁，因为森林遭到破坏，人们狩猎，非本土物种的出现
Threats of Deep Sea Biodiversity and its Conservation
深海生物多样性所受的威胁及其保护研究
the dangers that threaten us
威胁着我们的种种危险
"Their habitat is under threat while their food, a special type of wild bamboo leaf, is rare."
它们的安身之地受到了威胁,还有,它们的食物--一种特殊的野生竹叶,也变得非常稀少。
European Red List of Threatened Animals and Plants
欧洲受威胁动物和植物危急清单