关于unless的意思请教各位

desperatesea · 发表于 2009-5-2 09:57:00

F must be played immediately after R, unless G is played earlier than R.
这句话的逻辑关系是什么样的？是什么推出什么？

unless到底是什么意思？

先谢过!

windeyes6 · 发表于 2009-5-3 10:53:00

F必须在R之后，除非G在R之前（那么F 就不用立刻在R后面）

crusoecrusoe · 发表于 2009-5-3 12:12:00

F must be played immediately after R, unless G is played earlier than R.
这句话的逻辑关系是什么样的？是什么推出什么？

unless到底是什么意思？

逻辑关系中：A, unless B.
即：否B推A，否A推B

而本句话就是：除非G is played earlier than R，那么F must be played immediately after R，后者是前者的必要非充分条件。

desperatesea · 发表于 2009-5-4 21:48:00

谢谢楼上两位^^

goldlight · 发表于 2009-6-8 13:12:00

Agree with crusoecrusoe.

But I would like to share a little trick, if you don't know it already...

"unless = if not". So "A, unless B" is equivalent to "A, if not B", or "If not B, then A". => "Not B->A", or "Not A->B".

Powerscore LR book (?) teaches this way, when "A unless B", just negate A AND replace unless with ->. You will have "Not A->B"

crusoecrusoe · 发表于 2009-6-8 15:43:00

Thanks!!

desperatesea · 发表于 2009-6-9 22:46:00

thanks!

sofeworld · 发表于 2009-12-26 11:54:07

IF g >(EARLIER) r, THEN f DOESN‘T NEED TO PLAY IMMEDIATELY AFTER r

如果G比R 早，那么F不一定非要正好在R前面。

VALERIE242 · 发表于 2010-1-11 02:25:10

F must be played immediately after R, unless G is played earlier than R.

unless的意思就是if...not...这句话就可以这样表达：F MUST be played immediately after R, if G is not played earlier than R

关于unless的意思请教各位

关于unless的意思请教各位

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