1·Even if it ultimately proved possible to make an aeroplane completely invisible at all wavelengths, there would be a further problem.
即使有朝一日证明可以制造出在全波段都完全隐形的飞机，还会有一个更深一步的问题。
2·The first thought if you are hit by turbulence is to make the aeroplane safe.
一旦遭遇乱流你首先想到的就是要保证飞机的安全。