定语从句（三）：限制性与非限制性

But almost all have ignored the big, profitable opportunity in their own backyard: the wholesale food and drink trade, which appears to be just the kind of market retailers need.

主干But almost all have ignored the opportunity: the trade

但是几乎所有人都忽视了自家后院里巨大的、有利可图的机会：批发食品和饮料贸易，这似乎正是零售商所需要的那种市场。

看点`which appears...` 前有逗号，是非限制性定语从句，修饰 `the trade`，补充说明这个贸易的市场前景。

Ministers should also look at creating greater certainty in the rental environment, which would have a significant impact on the ability of registered providers to fund new developments from revenues.

主干Ministers should also look at creating greater certainty in the rental environment

部长们还应考虑在租赁环境中创造更大的确定性，这将对注册供应商依靠收入为新开发项目提供资金的能力产生重大影响。

看点`which would have...` 前有逗号，非限制性定语从句修饰前面的整个动作概念（创造确定性），补充说明其影响。

Last Thursday, the French Senate passed a digital services tax, which would impose an entirely new tax on large multinationals that provide digital services to consumers or users in France.

主干Last Thursday, the French Senate passed a digital services tax

上周四，法国参议院通过了一项数字服务税，这将对向法国消费者或用户提供数字服务的大型跨国公司征收一种全新的税。

看点句中包含两类定语从句：`which would impose...` 是非限制性，补充税的内容；`that provide...` 是限制性，无逗号，限定是哪类跨国公司。

That means more battles like the one now going on between the Justice Department and California, which enacted a tough net neutrality law in the wake of the FCC's abdication.

主干That means more battles like the one now going on between the Justice Department and California

这意味着会有更多像司法部和加州之间正在发生的那样的冲突，加州在FCC放弃监管后制定了一项严格的网络中立法律。

看点`which enacted...` 前有逗号，修饰专有名词 `California`，专有名词无需限定，此从句为非限制性，仅补充加州动作。

Neville Cardus, who wrote for the Manchester Guardian from 1917 until shortly before his death in 1975, is now known solely as a writer of essays on the game of cricket.

主干Neville Cardus is now known solely as a writer of essays on the game of cricket

内维尔·卡达斯从1917年到1975年去世前不久一直为《曼彻斯特卫报》撰稿，现在仅作为板球散文作家而为人所知。

看点`who wrote...` 两个逗号夹击，是典型的非限制性定语从句，插入主语和谓语之间，补充人物背景履历。

The plan has also been greeted with __18__ by some computer security experts, who worry that the “voluntary ecosystem” envisioned by Mr. Schmidt would still leave much of the Internet __19__ .

主干The plan has also been greeted with __18__ by some computer security experts

该计划也遭到了一些计算机安全专家的__18__，他们担心施密特先生设想的“自愿生态系统”仍会使大部分互联网__19__。

看点`who worry...` 前有逗号，修饰 `experts`，是非限制性定语从句，补充说明专家们的担忧态度，而非限定是哪类专家。