opened oil and gas gathering process

例句：

1. 1. The door was opened by the key.
   门被钥匙打开了。
2. 2. The new exhibit is opened to the public tomorrow.
   新的展览明天向公众开放。
3. 3. The secret was finally revealed after much searching.
   在经过大量的搜寻后，秘密终于被揭露了。