另一个让人稍有担心的问题是水下杂物会钻进涡轮机叶片中。
Another slight concern is submerged debris floating into the blades.
涡轮机叶片很难制造，因为它们要经受高温和高压的考验。
Turbine blades are difficult to make because they have to survive high temperatures and huge stresses.
每片涡轮机叶片由高强度单晶合金制成，上面覆盖强韧陶瓷涂层。
Each blade is grown from a single crystal of alloy for strength and then coated with tough ceramics.
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