1. The ground trembled, and suddenly a great gulf opened before us.
    地面震动, 突然我们面前出现了一道深沟.

2. The gulf extends northward.
    海湾向北方延伸.

3. These include the swift Gulf Stream current, the unexplored submerged valleys of the Atlantic and the often violent weather within the mystery zone.
    这其中包括墨西哥湾的湍急海流，尚未探测的大西洋海沟，以及该神秘区域经常变幻莫测的恶劣天气。