化石燃料（如煤和石油）属于有限资源。The fossil fuels (coal and oil) are finite resources.用煤作燃料的火力发电站的成本有望降低。The cost of electricity from coal-fired stations is expected to fall.当局已经敦促人们储备燃料。The authorities have urged people to stock up on...
He was badly concussed, the glass leaving two angry cuts across his forehead.他遭受了严重的脑震荡，脑门上留下的两道被玻璃划破的口子已经红肿。He was badly winded and concussed.他呼吸特别困难，而且有严重的脑震荡。My left arm is badly bruised and I was slightly concussed.....
They perceived that the enemy was trying to wear down their resistance.他们明白敌人是想用消耗的办法来制服他们的抵抗.Pipe smokers sometimes wear down the tips of their teeth where they grip their pipes.抽烟斗的人用牙齿咬住烟斗，有时会把齿尖磨平。The machines start ...
这些零件完好地焊在一起了.The parts welded together perfectly.卖方须完好地维护设备.The vendor shall maintain the equipment in good repair.包裹完好地到达我手.The parcel reached me safely....
This combination process is called the assemblage of stiffness matrices.这种组合的过程称为刚度矩阵的装配.It is important to distinguish matrices from determinants.将矩阵与行列式相区分是重要的.The conditions of simultaneous diagonalization of two matr...