... 强相互作用物理学 strong-interaction physics 强振荡 hard oscillation 氢微波激射器 hydrogen maser ...
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hard start of oscillation 振荡突起
hard self-excited oscillation 硬自激振荡
hard x-ray sawtooth oscillation 硬x射线锯齿振荡
hard pressing start of oscillation 振荡突起
hard genuine babbitt alloy oscillation 强振荡
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So this is a hard prediction what the period of an oscillation - should be — 21.5 plus or minus a half second.
因此这是个艰难预测，震荡的周期，应该是-，21。5加减0。5秒。
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