Studies of the sound radiation and vibration of the ring stiffened cylindrical shell under the circumferential excitation are important to predict the noise of the underwater naval craft.

周向激励下加筋圆柱壳体振动和声辐射特性的研究是预测水下航行器壳体噪声的关键环节。

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The Allies assembled a gargantuan naval Armada, from battleships and destroyers to landing craft and coasters.

同时盟军集结了大批的海军舰艇，从战列舰、驱逐舰到登陆艇、小船。

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In the months following, we extended testing to naval helicopters and, using an algae-based biofuel, to riverine combat craft.

在接下来的几个月里，我们将此类试验扩展到海军的直升机，并在河岸特战艇(riverine combat craft)上使用以藻类为主的生物混合燃料。

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Western military analysts have noted Russia's use of destroyers and landing craft from the Black Sea and Northern Fleets to back up its feeble Baltic-based naval forces.

ECONOMIST: NATO and Russia