But the recent confirmation of water sources on the moon and Mars may hint at a future where ALICE and similar rocketpropellants become highly practical.
但是，最近月球和火星有水源的确认可能暗示了ALICE和类似火箭燃料的未来，具相当高的可实践性。
2
Burning rate measurement with closed burner is a rapid method for measuring burning rate character and its change of solid rocketpropellants in a wide pressure range.
密闭燃烧器法是一种能测定很宽压强范围内固体火箭推进剂燃速特性及变化情况的快速测量方法。
3
However, from what I gather, "hybrid" rocket engines use both solid and liquid or gas propellants.