定語從句

　　1. The work that Tim Pons and his colleagues published last week is basic research into the portion of the brain, the cortex, that one scientist says is responsible for all the interesting things we do.

　　剖析：在這個長句中, 共有兩個定語從句, 第一句是that...last week, 第二句是that...we do. 另外, 這里還出現一個同位語結構the cortex, 以及一個插入成分one scientist says。所以, 經過分析后的句子應為: The work that Tim Pons and his colleagues published last week is basic research into the portion of the brain, the cortex, that one scientist says is responsible for all the interesting things we do.

　　2. An alternative measure used by Andronikou is the contact ratio, which is the inverse of tourism density, that is the ratio of the local population to tourist population.

　　剖析：這里也有兩個定語從句, 分別由which is 和that is 帶起。此外, 這里還有一個 過去分詞短語used by Andronikou, 分析后如下: An alternative measure used by Andronikou is the contact ratio, which is the inverse of tourism density, that is the ratio of the local population to tourist population.