pg 82 ~ 85
1. there are 3 things, they are opening and closing the door automatically, freeze foods to keep them fresh and move stuffs to casher.
2. using computers makes ouyr life easier, it does perfect job that what we told them to do. but when they make system fail, it will be big problem we cant make food to be keep frozen, we can't open and close the door for the whole day, we can't move all the heavy stuffs to casher for the whole day
3. there is senser in the door so when we get close to it, it will open. and it will close in few seconds.
4. it the instruction goes wong, the machine will not going to work as we want, if there is no car, the machine will stop
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