定语从句（16）
由“AS”引导的定语从句（续2） 在有些场合，“as”引导的定语从句可能是不完整的。我们只要把词的搭配及其译法记住就可以了，不必分析其从句内的成分。 Using the same reasoning(推理) as used before we shall obtain(得到) the following(以下的) expression(表达式). (“as”在此为关系代词，其后可看成省去了“was”) Radio waves travel(传播) at the same speed as light. (从句中省去了谓语动词“travels”，“as”在此为关系副词，等效于“at which”)
2、“as”与“such”搭配的情况 Such meters(仪表) as we use to measure current are called ammeters(安培表). Such slight(微小的) nonlinearities (非线性) as are found in vacuum tubes(真空管) may be neglected(忽略) in the small-signal case(小信号情况). We have studied in this chapter(章) the devices(方法) for solving(解) differential equations(微分方程) such as occur(出现) in physics and geometry (几何学).
(句中“such”与“as”紧靠在一起了，“such”是形容词作后置定语) Tremendously(极其) complex(复杂的) data telemetry(数据遥测) systems (系统)such as are used in the space program(航天计划) are not treated(论述) here.
3、“as”单独使用时的情况（不常见） Here we can use a push-pull(推挽) amplifier(放大器) as was described(论述) earlier in this section(节). Instead of(代替) lengths(长度) dx, dy, and dz as we use in the Cartesian system(笛卡尔坐标系) we shall have dr, rd, and dz.