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- Pharmaceuticals also are affecting sentinel species at the foundation of the pyramid of life -- such as earthworms in the wild and zooplankton in the laboratory, studies show. 研究显示，药物还影响到了位于生命金字塔基层的。。生物--例如：野生环境中的蚯蚓和实验室中的浮游动物。
- The press is a sentinel of our liberty. 新闻界是捍卫我们自由的卫兵。
- Do wolves belong to the canine species? 狼是犬科动物吗？
- We should do our best to save endangered species. 我们应该竭尽全力挽救濒于灭绝的生物。
- The lone sentinel walked toward his post. 忧愁的哨兵走向岗哨。
- This rare bird has become an endangered species. 这种珍禽已成为濒临灭绝的物种。
- A lady in full feather approached the sentinel on the sward. 一个衣着华丽的女人走近了草地上的哨兵。
- He was wearing a strange species of hat. 他戴着一种奇怪的帽子。
- There are many species of chrysanthemum. 菊花品种很多。
- Today the survival of our species is threatened. 今天人类的生存受到了威胁。
- The giant panda has become an endangered species. 大熊猫已成了一种濒临灭绝的动物。
- One who protects, keeps watch, or acts as a sentinel. 警卫象哨兵一样工作的人，守护，看守的人
- Unlike most other bats, this species is diurnal. 这种蝙蝠与大多数蝙蝠不同，是在日间活动的。
- sentinel species 前哨种
- A sentinel: isle of dreadful thirst. 奇渴岛上的岗哨。
- This species of flower flourishes in a warm climate. 这种花在温暖的气候中长得茂盛。
- One who protects,keeps watch,or acts as a sentinel. 警卫象哨兵一样工作的人，守护，看守的人
- An endangered species; an endangered culture. 濒临绝种的生物种类; 濒临绝传的文化
- Sentinel shutdown and support countdown shutdown. 支持定点关机和倒计时关机。
- The sentinel was stationed on a hill. 哨兵被派在山上站岗。
