ring systems
A mechanism for firing a gun that ignites the propellant by means of sparks produced when a spring-powered cock strikes a flint down on to a piece of hardened steel.
After a conquest.
Such an organism
plural of ring system
天文学者たちは、遠方の惑星を取り巻く環状構造を研究し、それらの組成や力学を解明しようとしています。
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