puzzled: adj. 困惑的
flexibility: n. 灵活性
variation: n. 变化
mechanically: adv. 机械地
stiff: adj. 呆板的
cultivate: v. 教育，培养
likewise: adv. 同样地
　　

It is discernable that…
The drawing reminds its audience of a widespread phenomenon in the area of…
As far as I am concerned, there needs to…
Only by…can we…