2. And then, unaccountably, she giggled. 然后，莫名其妙地，她咯咯笑了。
3. Animals are also affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably. 特别在地震前，动物也会受到影响，蛇被观察到从冬眠中醒来，老鼠从洞穴中逃走，狗会狂吠，猫会莫名其妙地跳来跳去。
4. The book unaccountably marked an epoch in my young life. 该书莫明其妙地成了我的童年生活中一个新时期的标志。
5. If you find yourself unaccountably laughing, for instance, you could be overdosing on manganese. 比如，如果你发现自己无缘无故地大笑，那可能是锰摄入过多。
