Optional ships will be considered part of same series of vessels if the option is exercised not later than 1 year after the contract to build the series was signed.是什么意思_Optional ships will be considered part of same series of vessels if the option is exercised not later than 1 year after the contract to build the series was signed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句