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1. The theory of relativity has revolutionized our understanding of space and time.
相对论理论已经彻底改变了我们对时间和空间的理解。
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2. The trajectory of the spacecraft is carefully planned to avoid collisions with asteroids.
宇宙飞船的飞行轨迹经过精心规划，以避免与小行星相撞。
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3. The project's theoretical trajectory is promising, but there are still challenges to overcome.
该项目的理论轨迹令人鼓舞，但仍有挑战需要克服。