There were already five ships being held by pirates before the De Xin Hai attack, according to the IMB.

国际海事局表示，在“德新海”号遭袭之前，已经有五艘船舶被扣留在海盗手中。

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In this paper, the DE algorithm was expanded to solve the mixed variables, restricted principal dimensions optimization.

将微分进化算法扩展到可求解混合变量、有约束的船舶主尺度优化问题。

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