sentinel species

• 前哨种

sentinel species的用法和样例：

例句

1. By enhancing nodal contrast, we have demonstrated that the graded shield technique is an effective method for improving the rate of sentinel node detection.
   由于增进侦测淋巴结与背景活性的对比，我们证明了层次遮蔽技术是有助于前哨淋巴造影侦测的一种有效方法。