2016年6月英语六级第1套真题句子解析： It is also the reason why development agencies are not united in their view of environmental issues; while some, like the WRI, maintain that environmental progress needs to go hand-in-hand with economic development, others argue that the priority is to build a thriving economy, and then use the wealth created to tackle environmental degradation.

It is also the reason why development agencies are not united in their view of environmental issues

"It" 充当形式主语，占据主语位置。真正的主语是 "why development agencies are not united in their view of environmental issues" 这个 why 引导的名词性从句，后置于系动词之后。这是典型的形式主语结构，用 it 占位以避免头重脚轻。

while some, like the WRI, maintain that environmental progress needs to go hand-in-hand with economic development, others argue that the priority is to build a thriving economy, and then use the wealth created to tackle environmental degradation

主句层："others argue that..."；第一层嵌套："that" 引导的宾语从句 "the priority is to build..."；第二层嵌套：不定式 "to build a thriving economy" 作表语，以及另一个不定式 "to tackle environmental degradation" 作目的状语。同时 "while" 引导的状语从句中也包含 "that" 宾语从句套 "to go" 不定式。整体构成从句套非谓语的两层嵌套结构。

like the WRI

"like the WRI" 是介词短语，由逗号标示，插入在主语 "some" 之后、谓语 "maintain" 之前，对 "some" 进行举例说明。这是典型的插入语，可以去掉而不影响句子主干的完整性。

to go hand-in-hand with economic development

"to go hand-in-hand with economic development" 是不定式短语，作动词 "needs" 的宾语，表达 "environmental progress" 需要做的事情。这是 need to do sth 结构中不定式充当宾语的标准用法。

to build a thriving economy

"to build a thriving economy" 是不定式短语，在 "the priority is to build..." 结构中作表语，说明 priority 的具体内容。这是不定式作表语的典型用法，主语通常是抽象名词如 aim/goal/priority 等。

the wealth created

"created" 是过去分词，作后置定语修饰名词 "the wealth"，表示被动关系（财富是被创造的）。这是过去分词作后置定语的典型用法，表达名词与分词之间的被动或完成关系。

to tackle environmental degradation

"to tackle environmental degradation" 是不定式短语，作目的状语，说明 "use the wealth created" 的目的。放在动词之后，表达 "为了解决环境恶化" 这一目的，是不定式作目的状语的标准形式。

while some, like the WRI, maintain that environmental progress needs to go hand-in-hand with economic development, others argue that the priority is to build a thriving economy

"while" 在此句中连接两个并列主语 "some" 和 "others"，表达对比关系(而、然而)，而非时间或让步关系。

判断 "while" 的语义需要看其连接的两个分句是否存在时间先后、让步转折或观点对比。本句中 "some...maintain" 与 "others argue" 呈现两种不同的观点立场，没有时间顺序也没有让步意味，因此是典型的对比用法。

识别对比用法的关键特征：1) "while" 前后分句主语通常是对立或不同的群体(如 some/others, A/B)；2) 两个分句陈述的内容形成鲜明对照或差异；3) 可用 "whereas" 替换而语义不变。

本句中 "while" 引导的对比结构跨度较长，"some" 分句包含 "like the WRI" 插入语和 "that" 宾语从句，"others" 分句同样包含 "that" 宾语从句和 "and then" 连接的并列成分，这种长距离对比增加了识别难度。

可迁移方法：遇到 "while" 时，先通过上下文排除时间关系(是否有明确时间点或动作同时性)，再判断是否存在转折让步(主句是否与从句预期相反)，若都不成立且前后陈述存在差异对比，则为对比用法。