1. We suffered many casualties during the unexpected onslaught of the enemy.
    在敌人突然袭击中, 我军伤亡惨重。

2. The Disneyland tour was replete with unexpected thrills and suspense.
    狄斯尼乐园充满了意想不到的刺激和悬念。

3. The news may be unexpected , nevertheless , it is true.
    这消息可能有点意外，然而却是真实的。

4. Nothing is so certain as the unexpected.
    天有不测风云，人有旦夕祸福。

5. Perhaps it is the desire for solitude or the chance of making an unexpected discovery that lures people down to the depths of the earth.
    寻求独处的愿望或寻求意外发现的机会的欲望吸引人们来到地下深处。