1. Discuss the differences in environment, such as controlled conditions in a pool versus natural conditions in the sea. 2. Mention differences in water conditions, like saltwater versus chlorinated water, and the presence of waves or currents in the sea. 3. Consider safety aspects, such as lifeguards in pools and potential hazards in the sea.

1. 討論環境的差異，例如游泳池中的可控條件與海洋中的自然條件。 2. 提到水的條件差異，例如鹽水與氯水，以及海中的波浪或水流。 3. 考慮安全方面，例如游泳池中的救生員及海洋中的潛在危險。