单词	鋪地之石
释义	英華☞片石
随便看	optical numerical aperture optical nutation optical observation optical oceanography optical opacity optical orientation optical orthogonal code (optical) orthorhombic crystal optical oscillator optical oscillograph optical out-coupling optical output power optical output ratio optical ozonesonde optical ozonesonde (system) optical packaging optical packet optical packet communication optical packet network optical packet switch optical packet switched networks optical packet switching optical page reader optical page reader (opr) optical page reader {=opr}