At the macroscopic level, an ideal gas is defined by a process of extrapolation.从宏观角度看, 理想气体的定义是由推论而得来的.From the macroscopic properties of gravity you can work out what the graviton should be like.从引力的宏观属性,你可以推算出引力子的大致情况...
我们需要各方面的帮手：工程师、科学家（例如地质学家）和教师。We need helpers of all types, engineers, scientists (e.g. geologists) and teachers.查理？噢，他是个不可多得的好帮手，非常喜欢孩子。Charlie? Oh, he's a treasure, loves children.这种电池充电器是摄影工作者的好帮手。This battery bo...