In words, l_i(x) is constrained to 1 at and to 0 at
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船长应当采取必要的措施，保护船舶和在船人员、文件、邮件、货物以及其他财产，防治船舶污染生态环境。
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"I feel honoured to be part of the team that can make a difference," says Squire, pictured with friend and colleague Pete Manning