Biological communities are initially limited by the existing physical properties of the site on which they occur . 生物群落在其出现的地区最先受到生存环境自然特点的限制。
The brunt of the russian attack fell at first upon the frontier defences of the finns in the karelian isthmus . 苏联进攻的主力，最先是集中在卡累利阿地峡芬兰的边境防御工事。
The most advanced portion of the human race were halted, so to express it, at certain stages of progress . 人类中最先进的一部分，当其处在进步过程的某一阶段时，似乎停步不前。
Dunsford attached himself to philip merely because he was the first person he had known at st. luke's . 邓斯福特同菲利浦亲近，仅仅是由于菲利浦是他在圣卢克医院最先认识的人而已。
He took it out at the earliest opportunity, and the first two hedges and a ditch the horse cleared easily . 他一有机会便把它骑了出去，这马轻轻易易地越过最先的两道篱笆和一道壕沟。
Yet this useless-looking chip represents the most highly skilled technology at every step of its manufacture . 然而这个看上去无用的集成电路块在其生产的各个步骤上却代表了最先进的技术。
Geometry, the first branch of mathematics that was brought to a sophisticated level, is based simply on the idea of length . 几何学是数学中最先提高到精湛水平的一个分支，它仅仅建立在长度概念的基础上。
Purple loosestrife arrived early, shaking luxuriant tangled locks along the edge of the mirror whence its own face laughed back at it . 紫色的珍珠菜最先登场，它沿着如镜的水面抖开浓密的丝发，露出自己的笑脸。
The impact of technological change on employment has been raised many times since ricardo's original contribution to the subject . 关于技术变化对就业的影响问题，自从李嘉图最先提出以来，人们又多次讨论这个问题。
The most advanced stages of capitalism, which feature imperialism as their dominant mode of operation, contain internal contradictions which harbor the seeds of their own destruction . 以帝国主义作为主要活动方式的资本主义的最先进阶段，孕育着自行毁灭的内部矛盾。
