By default, if a connection is put back in the free pool and not used again for at least 30 minutes, it is closed, provided that closing it will leave at least one connection in the free pool.
在缺省情况下，如果连接放回空闲池中并且至少30分钟没有再使用它，并且关闭该连接后，空闲池中至少还保留一个连接，则将关闭该连接。
Although it may seem logical, this has an important effect: If a database connection is closed for some reason, any database objects that it contains are also closed.
虽然这看上去合乎逻辑，但是存在一个重要影响：如果由于某种原因关闭了数据库连接，那么也将关闭该数据库包含的所有数据库对象。
What it says is if s is a closed surface — Remember, it is the same as with Green's theorem, we need to have something that is completely enclosed.
它说的是，如果s是一个封闭曲面，这和格林定理是一样的，我们需要完全封闭的。
Obviously, this has no effect if the connection was already closed (but it never hurts to explicitly close it).
显然，如果已经关闭了连接，这一代码就无效(但是，显式关闭它决不会带来任何害处)。
If it is a closed curve, we should be able to replace it by a double integral.
如果是一条闭曲线，也可以用二重积分来代替的。
You have to go back to December 3rd 2008 to find the last time the bank's stock closed at the same price as it did yesterday, even if it still sits 36% above its 2008 nadir.
尽管现在依然比2008年的最低点高出36%，昨天的银行股票价格与2008年12月3日接近。
The pointer is warped to where it was when the menu was invoked if it was both invoked and closed with a keystroke.
当菜单通过击键激活或者关闭的时候，鼠标会被移到菜单所在的位置。
Then she went home and planted it, and immediately there grew up a large handsome flower, something like a tulip in appearance, but with its leaves tightly closed as if it were still a bud.
不久以后，一朵美丽的大红花就长出来了。它看起来很像一朵郁金香，不过它的叶子紧紧地包在一起，好像仍旧是一个花苞似的。
Then she went home and planted it, and immediately there grew up a large handsome flower, something like a tulip in appearance, but with its leaves tightly closed as if it were still a bud.
不久以后，一朵美丽的大红花就长出来了。它看起来很像一朵郁金香，不过它的叶子紧紧地包在一起，好像仍旧是一个花苞似的。
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