run out:
1.被用完,被耗尽
Our food soon ran out.
我们的食物不久就吃光了。
2.到期,期满
3.跑开
4.结束；变得缺乏

look for:
寻找
She is looking for her lost child.
她正在寻找失去的孩子。

as long as:
固定词组 ph.
1.只要
As long as do not rain!
只要不下雨就行！

track:
名词 n. [C]
1.行踪;轨道;足迹[P1]
We followed his tracks in the snow to a hut.
我们沿着他在雪地上留下的足迹走到一间小屋旁。
2.小径,小道
3.铁轨,轨道[P1]
The train jumped the track.
火车出轨了。
4.【体】跑道;径赛运动
He runs around the track every morning.
他每天清晨绕着跑道跑步。
5.历程;行动路线;思路
You're on the wrong track.
你想得不对了。
6.惯例,常规
7.(坦克等的)履带

及物动词 vt.
1.跟踪;追踪[(+to)]
It was not long before I tracked down the lost wallet.
不久我就找到了遗失的钱包。
The hunter tracked the wolf and managed to catch it.
猎人追踪狼,并设法逮住它。
2.沿着(道路)走
3.走过,通过
4.在...上留下足迹
The dog tracked mud all over the shiny kitchen.
狗在厨房发亮的地板上留下一屋子泥。
The child rushed into the room and tracked dirt over thefloor.
小孩冲进房间,地板上全是带泥的脚印。
5.为...铺轨

不及物动词 vi.
1.追踪
2.留下足迹
3.(摄影机)跟踪摄影[Q]
4.走[(+about)]