1·Cautiously add, dropwise, 30 percent hydrogen peroxide, allowing the reaction to subside and again heating between drops.
逐滴小心地加入30%的过氧化氢，每加一滴均要等反应平息后再次加热。
2·He points to an Earth bug called the bombardier beetle that produces a boiling-hot spray that is 25 percent hydrogen peroxide as a defense weapon.
他表示一种称之为”轰炸员“的地球虫类，能分泌出一种滚烫的液滴作为自我保护的工具，这样的液滴中含有百分之25%的双氧水。
3·This process accounts for 60 to 90 percent of the present loss of hydrogen from Earth and most of the hydrogen loss from Venus.
这样的过程占当今地球氢气损失总量的60 ~ 90%，也是金星氢气损失的主要过程。
4·Still, hydrogen is the lightest of all elements, so it only accounts for roughly 72 percent of the sun's mass, while helium makes up about 26 percent.
氢也是所有元素中最轻的，所以它大约只占太阳总质量的72%，氦大约占26%。
5·The resulting stream of charged particles, called the polar wind (not to be confused with the planetary wind), accounts for 10 to 15 percent of Earth's hydrogen loss and almost its entire helium leak.
由此形成的带电粒子流，就叫做“极地风”(polar wind)，可占地球氢元素泄漏过程的10 ~ 15%，而几乎所有的氦气就是以这种方式脱离地球的。
6·Dust grains are only about 1 percent of its mass, with hydrogen accounting for 80 percent and helium providing most of the rest.
尘埃颗粒只约占组成介质群的百分之一，氢占百分之八十，其余的全是氦。
7·Though the fuels are frosty, upon ignition they generate scorching steam (5, 000 degrees) and plenty of thrust: Hydrogen is 40 percent more efficient than other propellants.
虽然极寒，而在点火后此燃料可以产生炽热的蒸汽(5000度)和足够的推力：氢比其它推进器燃料的效率高出40%。
8·Oxygen, the most abundant chemical element, is present in combination with hydrogen to the extent of 89 percent in water.
在水中，氧这种最丰富的化学元素与氢结合，其含量多达89%。
9·Then the evaporation rate of liquid hydrogen is forecasted by comparing the experiment result and theoretical calculation under the fill level of 90 percent.
对90 %充满率条件下的实验结果与理论计算进行比较，通过理论计算结果与液氮蒸发率实验结果对液氢试验蒸发率作了预测。
10·Computer deconvolutions of the Raman spectra allow the percent of tetrahedral hydrogen bonded structure of water to be determined.
对所得到的拉曼光谱进行了计算机去卷积处理，并由此计算了不同溶液中水的四面体结构的百分数。