Dugas's sign

例句：

1. 1. The discovery of this new species is a significant contribution to the field of biology.
   这一新物种的发现对生物学领域具有重要意义。
2. 2. In his research, he often uses Dugas's sign as a key indicator of genetic diversity.
   在他的研究中，他经常使用杜加斯的符号作为遗传多样性的关键指标。
3. 3. The team leader noticed that there was a Dugas's sign on the map indicating a potentialroute to the next town.
   团队领导注意到地图上有一个杜加斯的符号，指示着通往下一个城镇的潜在路线。