sentinel

n.

岗哨，哨兵；

复数：sentinels

stand sentinel站岗，放哨，守卫

1. The sentinel was stationed on a hill.
   哨兵被派在山上站岗。
2. The press is a sentinel of our liberty.
   新闻界是捍卫我们自由的卫兵。
3. At either end of the bridge a sentinel stood with rifle at ready.
   桥的两头各有一名哨兵，荷枪实弹守卫着。

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The sentinel node in breast cancer--a multicenter validation study.
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Lymphatic mapping and sentinel lymphadenectomy for breast cancer
Lymphatic Mapping and Sentinel Node Biopsy in the Patient With Breast Cancer
A randomized comparison of sentinel-node biopsy with routine axillary dissection in breast cancer
Sentinel Lymph Nodes Show Profound Downregulation of Antigen-Presenting Cells of the Paracortex: Implications for Tumor Biology and ...
American Society of Clinical Oncology guideline recommendations for sentinel lymph node biopsy in early-stage breast cancer
Validation of the Accuracy of Intraoperative Lymphatic Mapping and Sentinel Lymphadenectomy for Early-stage Melanoma: A Multicenter ...
Axillary dissection vs no axillary dissection in women with invasive breast cancer and sentinel node metastasis: a randomized clinic...