1、McCain was shot down over North Vietnam and was held as a prisoner of war under brutal conditions.
麥凱恩在越南北部被擊中，成為戰(zhàn)俘，并忍受殘酷惡劣的戰(zhàn)俘生活條件。

2、The taxon was previously known from North Vietnam and Northeast India.
該種的分布原來只知道在越南北部和印度東北部。

3、By 1975, when North Vietnam tried another massed armored invasion, several key things had changed.
到1975年，當北越試圖再次發(fā)動大規(guī)模的裝甲入侵時，多種關鍵因素已經(jīng)發(fā)生了變化。