This time, they noticed a small black mark directly in the center of my father's eyeball.
这一次，他们看到一个小黑点正好在父亲的眼球中央。
For the eyeball composed of membrane and liquid, the contrast of ultrasound imaging is not high due to its small variance in acoustic impedance.
对于由膜组织和液体构成的眼球来说，由于其超声阻抗差别不大造成眼超声成像的对比度不高。
For the eyeball composed of membrane and liquid, the contrast of ultrasound imaging is not high due to its small variance in acoustic impedance.
对于由膜组织和液体构成的眼球来说，由于其超声阻抗差别不大造成眼超声成像的对比度不高。
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