(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
防线
fáng xiànㄈㄤˊ ㄒㄧㄢˋ
defensive line or perimeter[cedict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
与
yúㄩˊ
yǔㄩˇ
yùㄩˋ
(same as 歟|欤, final particle expression doubt or surprise, similar to 吗 or 呢)[cedict]
and; to give; together with[cedict]
take part in[cedict]
敌人
dí rénㄉㄧˊ ㄖㄣˊ
enemy[cedict]
交火
jiāo huǒㄐㄧㄠ ㄏㄨㄛˇ
fire-fight; shooting[cedict]
东边
dōng bianㄉㄨㄥ ㄅㄧㄢ˙
east; east side; eastern part; to the east of[cedict]
一
yīㄧ
one; 1; single; a (article); as soon as; entire; whole; all; throughout[cedict]