The fireboat went to the buring ship.消防艇向那艘燃烧着的船开去.One fireboat will replace the existing Fireboat No.3 and the other the Fireboat Alexander Grantham.其中一艘灭火轮将取代现时的三号灭火轮,另一艘则取代葛量洪号灭火轮....
Tritium is one of the mildest radioactive isotopes.氚是最和缓的放射性同位素之一.More reactive are the heavier isotopes of hydrogen, deuterium and tritium.更为活跃的是氢的较重同位素, 氘和氚.Tritium has a half - life of 12.4 years.氚的半衰期为12.4年,地球形成时的氚早已...
They are not second - order approximations, but are exact for any amount of deformation.它们不是二次近似, 而是对任何变形量都成立的精确表达式.We do not have the true figures so we will have to make some approximations.我们没有真实的数字，因此只能作些粗略的估计。There ...