S-regular opened set S正则开集
The student let him down, opened the sack, and set him free.
书生放他下来,打开口袋,放了他。
I opened the gate, and was immediately set on by a large dog.
我一开门,一条大狗就迎面扑来。
She opened a small shop where she sells her bags, and she has also set up a website to sell them online.
她开了一家小商店,卖她的包,还建立了一个网站,在网上销售这些包。
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