zhè / zhī / hǎi / kōng / jūn / fù / zé / bǎo / wèi / guó / jiā / de / hǎi / shàng / hé / kōng / zhōng / ān / quán

这支海空军负责保卫国家的海上和空中安全。

This navy and air force is responsible for protecting the country's maritime and airspace security.