Always use an external source of nitrogen or air for this purpose.
做类似事情时，只能用氮气或空气作为外在气源。
When forward motion is imparted to it from an external source, air is forced.
当由外部能源强迫其向前运动时，空气被迫进入进气道。
The atoms are excited by being irradiated with energy from an external source.
原子受到外部能源的照射而激发。
Motion and speed are sensed without mechanical couplings, bearings, linkages or an external power source.
运动和速度感到无机械轴承，联系或外部电源。
Motion and speed are sensed without mechanical couplings, bearings, linkages or an external power source.
运动和速度感到无机械轴承，联系或外部电源。
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