The Soviet Union was a civilization of fear, where people lived in constant dread of the knock on the door at night.

The future of quantum computing depends on our ability to overcome the challenges of noise and decoherence.

The elements of consciousness are to be discovered by careful analysis.

解释：砍伐树木不把树根砍掉，必能重新生长；堵塞水不把源头堵住，必会重新流出；消除祸患不铲除产生祸患的根基，祸患还会再生。