bumpier
adj.
困难重重的( bumpy的比较级 );
崎岖的;
（使） 处境艰难;
气流不稳的;
例句:
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But crisp, taut handling can make for a bumpier ride.
来自WSJ
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Buckle your seat belts, it's about to get even bumpier.
来自WSJ
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They are much bumpier than that, which can completely change your distribution of stress on the whole fault.
来自VOA