1. downside n. 下降趋势；底侧

The downside is that customers must have a card reader attached to their computer.
缺点是消费者一定要被附上一个卡片读者到他们的电脑。

The only downside was that you could not sleep in as the rooms are near a busy street.
唯一的不足就是，因为房间靠近繁忙热闹的街道，使你根本就不能入睡。

2.overlook vt. 忽略；俯瞰；远眺；检查；高耸于…之上

The important details were overlooked by them,
很重要的细节都被他们忽略掉了。

We can overlook the sea from the window of our room.
从我们房间的窗口，我们可以俯瞰大海。

3.a stack of 一堆，一叠
4.mechanical adj. 机械的；力学的；呆板的；无意识的；手工操作的

The most mechanical reaction to suffering is negative emotions.
对于痛苦最机械的反应是负面情绪。

It is these facts which make forecasting an art and not just a mechanical procedure.
正是这些实际情况使预测成为一种艺术而不是一个机械的过程。