「開戰」

(pos:動詞)
<explanation>
yue:開始#打仗
eng:to start a war
<eg>
yue:兩國宣佈正式開戰。 (loeng5 gwok3 syun1 bou3 zing3 sik1 hoi1 zin3.)
eng:The two nations formally declared war (on each other).