He unbuckled his seat belt.

他松开了他的安全带搭扣。

He then unbuckled my seatbelt.

然后，就解下了我的安全带。

Then I had an idea. I unbuckled my belt.

忽然间，我有了一个想法，我解开了腰带。

Standing up, he unbuckled his belt, and spread it laden across his waist.

他站了起来，解开腰带，带子的一头垂到腰部以下。

As it unbuckled, a 250-mile-long coastal section of Japan dropped in altitude by two feet, which allowed the tsunami to travel farther and faster onto land, Dr. Stein said.

由于解除了张力，250英里的日本沿海部分海拔下降了2英寸，这使得海啸更快更远的冲向陆地，斯坦恩博士说道。