Yǔzhòu shì wúqióng-wújìn de, rénlèi wúfǎ tànsuǒ qí quánbù.
The universe is boundless; humanity cannot explore all of it.
Tips
memory
无穷 = without extreme/end; 无尽 = without exhaustion. Both halves mean the same thing, doubled for emphasis - a classic Chinese rhetorical technique called 同义叠用 (synonym doubling).
