潜艇在深海中保持隐蔽。
The submarine maintains ___stealth in the deep sea.
忍者依靠隐秘行动来接近目标而不被发现。
The ninja used ___stealth to approach the target undetected.
这架轰炸机采用了先进的隐身技术以规避探测。
The bomber incorporated advanced ___stealth technology to evade detection.
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