例句與造句

1. Retrievable packers have a more complicated design and generally lower sealing and gripping capabilities, but after removal and subsequent servicing, they can be reused.
2. In situations where a packer must be easily removed from the well, such as secondary recoveries, re-completions, or to change out the production tubing, a retrievable packer must be used.
3. It's difficult to find retrievable packer in a sentence. 用retrievable packer造句挺難的