3. which指物,作主语或宾语 (作宾语可省略,如介词提前则不能省) These are the trees which were planted last year. 这些是去年种植的树。 This recorder (which he is using is made in Japan 这个他正在使用的录音机是日本产的。3. which 指物，作主语或宾语 (作宾语可省略, 如介词提前则不能省) These are the trees which were planted last year. This recorder （which） he is using is made in Japan. 这些是去年种植的树。 这个他正在使用的录音机是日本产的