伯吉斯页岩地层中也有许多代表着现代动物群中已经灭绝的物种的化石。
The Burgess Shale formation also has fossils of many extinct representatives of modern animal groups.
与这项新技术密切相关的是一群现代商人，他们越来越重视做海外生意的经济价值。
Deeply involved with this new technology is a breed of modern business people who have a growing respect for the economic value of doing business abroad.
当一群人暴露于病毒或食物毒的时候，现代医学仅仅检测那些生病的人。
When a group of people are exposed to a virus or food toxin, modern medicine examines only those who get sick.
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