以下为句子列表：
英文: The rubber seal is designed to keep out all the moisture.
中文: 橡胶的密封垫是用以隔绝湿气的.
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英文: The seals of tubing spool and tubing hanger are classified as two types:vertical rubber seal and tapper metal seal.Users can select one of them upon their requirement.
中文: 油管四通和油管悬挂器分两种密封结构形式，一种是直座式橡胶密封，一种是锥座式金属硬密封，可根据不同需要确定其选用形式。
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