Changes that take place in the physical world are in variably the result of forces.

　　發(fā)生在物質世界的所有變化無一不是力的結果。

　　Other associated neurological symptoms, such as numbness and weakness, are variably present.

　　其他的相關神經癥狀，如麻木和無力等，表現則個不相同。

　　The stomatal index in the adaxial epidermis changed variably during development of cotyledons.

　　上表皮氣孔指數的變化規(guī)律不明顯。