coherent
adj
(of ideas, thoughts, speech, reasoning, etc) connected logically or consistent; easy to understand; clear (指看法、 思想、 言语、 推理等)有条理的, 前後一致的, 易懂的, 清楚的
a coherent analysis, argument, description, etc 前後一致的分析、 论证、 描述等
The Government lacks a coherent economic policy. 政府的经济政策缺乏一致性.
He's not very coherent on the telephone. 他打电话时语无伦次.
But can we blame those who looked and failed to see what Galileo saw, if we remember that to use a telescope at the limit of its powers calls for long experience and intimate familiarity with one's instrument?