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重点讲解：
1. look for 找；寻；
They look for foods that are low in calories.
他们要找低卡路里的食物。
2. grind up 磨碎；碾碎； 将…磨成粉；
He makes his own paint, grinding up the pigment with a little oil.
他就着几滴油磨了些颜料，自己制油彩。
3. tip sb. off 给…通风报信；暗中告知；
Greg tipped police off on his car phone about a suspect drunk driver.
格雷格用他的汽车电话向警方报告了一个有酒后驾驶嫌疑的司机。
4. set up 创建；建立；安排；组建；
Tents have been set up next to hospitals to handle the overflow.
医院旁搭起了帐篷以安置容纳不下的人员。
adj. 不动的(稳定的)
n. 固定物(驻军
