Because it's this plus that that's equal to zero, and there's the minus sign that I forgot to write down.
因为这个加上这个等于零，这里我忘写了一个负号。
The results appear to be accurate to within plus or minus 9 years.
试验结果显示的最大误差为正负9年。
The rule is: If there is a plus somewhere, then there's a minus next to it and below it.
规则：如果有一个+号，右边和下边都是-号。
Then F is one minus one plus two, is equal to two.
那么F等于1减去1再加上2。
To find the time to consider, do in a day, plus or minus sign.
要找出时间来考虑一下，一天中做了什么，是正号还是负号。
To find the time to consider, what did during the day, it is plus or minus sign, if is a very good plus.
要找出时间来考虑一下，一天中作了什么，是正号还是负号，假如是正号很好。
To find the time to consider, what did during the day, it is plus or minus sign, if is a very good plus.
要找出时间来考虑一下，一天中作了什么，是正号还是负号，假如是正号很好。
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