B You can say a minus B is a plus minus B and we know how to add vectors and we know what minus B is.
可以把A减b看作a加负,我们既知道怎么做加法,也知道负b是什么。
So basically if we think of buckets and pipes, that's a very thin pipe connecting the bucket for A and B, B so we drip from A to B, C then we have this very fat pipe connecting B and C.
大体上如果我们想象桶和管子,连接A桶和B桶的管子很细,所以液体从A滴入,然后我们有很粗的管子连接B和。
This irreflexivity can be used to set up an equivalence relation—that is, for Key s a and b , if comp(a, b) is false and comp(b, a) is false , then a and b must be equivalent.
这个反自反性质可以用来建立一个等价关系(equivalence relation)—也就是,对于Keys a和b来说,如果comp(a,b)为false并且comp(b,a)也为false,那么我们就说a和b是等价的。
Getting a grade like a B-plus or a C-minus adds or subtracts a few tenths of a point.
VOA: special.2009.03.05
a You know that what will happen is that heat will flow from a to b from b to c and from a to c. That's common-sense.
你知道会发生的是热量从流向,从流向,以及从流向。
who're interested, (a) in improving their own Spanish- speaking skills, and (b) helping out the community.
如果他们对这个活动感兴趣,想要提高自己的西班牙语水平,同时愿意为社区尽一份力,
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