定语从句（11）
一、修饰整个主句的非限制性定语从句(这时“which”一般译成“this”，当为过去时或将来时时可以译成“that”) 修饰整个主句的情况 1、“which”在从句中作主语的句型 ～（主句），which means/implies/indicates/is that … n2 is even(偶的), which implies(意味着) that n is even.
Some materials(物质) are liable (易…的) to absorb(吸收) moisture(潮湿), which will adversely(逆地) affect(影响) their insulating(绝缘的) properties(性质). The motion(运行) of a rocket(火箭) does not depend on the presence(存在) of air, which was proved(证明) in 1916.
2、“which”在从句中作介词宾语的定语 in which case (condition; state) ～（主句）， at which time (instant; point) for which reason … I1 is much greater than I2, in which case I2 can be neglected(忽略). This circuit(电路) was analyzed(分析) previously(前面) (see Fig. 5. 21), at which time we obtained(获得) the following (以下的)equation(式子).
3、“which”在从句中作介词宾语 from which … after which … ～（主句）， because of which … as a result of which … A beam(束) of white light(白光) is separated(分解) into beams of various(各种) colors(颜色), from which we conclude(得出结论) that white light is actually(实际上) a mixture(混合物) of light of these different colors.
Charging(充电) requires(需要) an external source(外部电源) to furnish(提供) electric energy, after which the battery(电池) again can supply(供应) energy in chemical form(化学方式). 4、“which”在从句中作宾语（不多见） This equation(方程) must be put in standard form(标准形式) first, which we do by dividing through by 64(上下除以64).