At present, the safe volume of blood substitute is limited to 500 to 1,000 milliliters.

目前, 血液替代品的安全使用体积被限制在500-1000毫升.

《简明英汉词典》

The flowing counter pulsating and volume of blood stream were showed clearly in colour doppler.

彩色多普勒(doppler)清楚显示眼上静脉血液逆向流动及搏动频谱.

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