it's difficult to account for the warmth using just the mechanisms suggested in this paper, kasting says. 「so, i think there is still a need for additional greenhouse gases.」
卡斯丁指出,仅仅利用该论文中提出的机制很难说明当时的温暖状况,「所以,我认为仍然需要用额外的温室气体来进行解释」。
all these factors contribute to the proven health of vegetarians although it is difficult to account for the exact contribution of each nutrient.
所有这些因素都有助于证明健康的素食主义者虽然很难帐户的确切贡献,每个养分。
linguistic information is usually represented in symbolic form, but this practice makes it difficult to account for the processes of speaking and understanding.
语言信息一般表征为符号形式,但是如此表征难以表述发话和理解过程。