In 1907, Einstein likely did not foresee a time when dust-sized particles of glass could be trapped and suspended in air by dual laser beam "optical tweezers."
1907年时，爱因斯坦似乎没能预见到这样的时代，在这个时代，“镭射光钳”发射双重激光，从而困住灰尘一般大小的玻璃微粒，使它们悬浮在空中。
Most types of top contact shoes simply hang from a beam suspended between the axleboxes of the bogie.
多数类型的上触式集电靴被在转向架的轴套之间的一个悬挂杆吊着。
They could see the dust suspended in the beam of light.
他们能看见悬浮在那道光中的灰尘。
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