Astronomers must infer the existence of black holes, which are invisible, from their gravitational influence on the visible bodies surrounding them.
天文学家必须从黑洞对周围可见天体的引力影响推断出不可见的黑洞的存在。
The poet says there are many visible or invisible walls in the world that have no necessity of existence.
诗人认为，那些有形的或无形的墙，在世界上已经没有必要存在了。
Therefore, these mysterious matters are invisible, but astronomers know about their existence through the exploration of the gravitational interaction between them and ordinary matters.
因此这些神秘的物质是看不见的，但天文学家通过探测它们和普通物质之间的引力相互作用得知了它们的存在。
Now by the uninitiated I mean the people who believe in nothing but what they can grasp in their hands, and who will not allow that action or generation or anything invisible can have real existence.
我所指的是那些只相信我握在他们手里的东西的人。他们不愿意承认那些看不见的行为、结果或其他的任何东西可能实际存在。
Not only can the data be securely encrypted within a digital tape, but the library's existence on the tape would be invisible even to powerful computers.
这些数据不仅能够非常安全地被加密在数字带中，而且，甚至连强大的计算机都察觉不到这个数据库的存在。
Not only can the data be securely encrypted within a digital tape, but the library's existence on the tape would be invisible even to powerful computers.
这些数据不仅能够非常安全地被加密在数字带中，而且，甚至连强大的计算机都察觉不到这个数据库的存在。
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