fly the flag

(of a ship) be registered in a particular country and sail under its flag

（船）在某國注冊并掛該國國旗行駛

keep the flag flying

represent one's country or organization, especially when abroad

（尤指在海外時）代表自己的國家（或組織）

British products are keeping the flag flying for the home country.

英國產品代表著英國形象。

put the flags (或 flag) out

celebrate

慶祝，慶賀

temperatures are increasing again—that's why we're putting out the flags.

氣溫又一次在回升——所以我們要慶祝。

show the flag

(of a naval vessel) make an official visit to a foreign port, especially as a show of strength

（尤指海軍艦艇為展示實力而）正式訪問外國港口

wrap oneself in the flag

(chiefly N. Amer.)make an excessive show of one's patriotism, especially for political ends

(主北美)（尤指為政治目的而）過分表現愛國熱情