But the usual causes of natural variability do not seem to explain the current trend, so scientists incline to the view that it is man-made.
但通常的自然变异原因似乎解释不了目前的趋势，所以，科学家倾向于认为这是人为的。
Viewed from the front, legs do not move in exact parallel planes, but incline slightly inward to compensate for shortness of leg and width of chest.
从前面观看，四肢行走时并不在一个平行的平面上，而是稍微内收，以弥补腿短与宽胸的缺陷。
Viewed from the front, legs do not move in exact parallel planes, but incline slightly inward to compensate for shortness of leg and width of chest .
从正面观察，腿并非完全相互平行，而是略向内弯，以抵消腿短而胸宽所造成的不便。
Viewed from the front, legs do not move in exact parallel planes, but incline slightly inward to compensate for shortness of leg and width of chest .
从正面观察，腿并非完全相互平行，而是略向内弯，以抵消腿短而胸宽所造成的不便。
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