COAXIAL shaft, Two shafts rotating one inside the other for rotating the low and high pressure compressors by the low and high pressure engine turbines.

同心轴，两个套在一起旋转的轴。用于使发动机低压和高压涡轮分别带动低压和高压压气机。

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The first attempt to launch the rocket was halted Saturday when a flight computer detected high pressure in an engine combustion chamber.

CNN: Historic launch of private rocket heralds new era

The XOS 2 is nearly usable for the latter job, but even at 50 percent more efficient than the original (by the company's last count) it's still a prototype that requires a tethered high-pressure hydraulic engine to function.

ENGADGET: Raytheon's Sarcos XOS 2 military exoskeleton just does the heavy lifting -- for now

The resulting high pressure, however, requires a big, heavy engine to contain it.

ECONOMIST: Monitor