Some scented oils are not suitable for direct application to the skin, possibly causing irritation or allergic reactions.
一些香水精油不适合直接用在皮肤上，因为可能会产生刺激或者引起过敏反应。
Not all essential oils are suitable for use in aromatherapy.
并不是所有精油都适合芳香疗法。
New catalysts suitable for hydrogenation of food oils have been prepared by means of precipitation method and by chemical mixing procedure.
研究了用沉淀法和化学混合法制备的用于食用油脂加氢改性的镍催化剂。
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