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

　　發(fā)生在物質(zhì)世界的所有變化無(wú)一不是力的結果。

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

　　其他的相關(guān)神經(jīng)癥狀，如麻木和無(wú)力等，表現則個(gè)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律不明顯。