在视网膜的中央凹的视力比网膜其他部份更敏锐。
Vision is much more acute at the fovea than at other portions of the retina.
工人周一在纽约市中央公园，拆掉部份由艺术家克里斯托和珍妮-克洛德创作、延绵三十七公里、以七千五百零三道门造成的艺术品。
Workers take down some of the 7,503 gates lining 37 kilometres of Central Park, which was part of the art installation created by artists Christo and Jeanne-Claude in New York on Monday.
中央部份可氖三维运动，让用者在不使用气压弹簧的情况下作无阻力横向屈曲。
With 3-dimension motion of the mid-body you can achieve frictionless lateral flexion with no movement in the gas springs.
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