I the first touch is two moonths ago, the crossword puzzles usually in a large square lattice, it divide two parts:one part is across,another is the down,they are criss-cross, it has 1 to 12 numbers in it ,there is a blank after the numbers ,that's you should fill in a word into it. You must accroding to clue to fill it . there is 3 difficulty to choose,from easy to hard.the content include all aspect of our life and culture etc.
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DOM is easy to use (except when it's unnecessarily hard, like getting the text from an element), but can be bloated and a memory hog.
DOM易于使用(尽管有时候存在一些不必要的麻烦，比如提取元素中的文本)，但它可能变得很庞大，占用很多内存。
If you build an encryption algorithm around a function's easy direction, anyone wanting to break your encryption needs to work at it from the hard side.
如果围绕某个函数的简单方向构造一个加密算法，那么想要破解加密的任何人都需要从相反的方向来解密。
In theory, this should make it hard to forge paperwork and easy to catch those who misrepresent the amount of wood they have harvested, or where it has come from.
理论上，这将使得文书难以伪造，也更容易抓住那些虚报采伐木材总量和来源地的人。
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