The 999 hotline service was enhanced with the provision of caller number display to enable a quicker response to emergency calls. The number of operator positions in the 999 centres was also increased.是什么意思_The 999 hotline service was enhanced with the provision of caller number display to enable a quicker response to emergency calls. The number of operator positions in the 999 centres was also increased.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句