Soldiers stood sentinel with their muskets.

士兵们持枪站岗。

A tall round tower standing sentinel over the river.

一座高高耸立在河上方的圆塔。

The first national HIV sentinel surveillance programme in the developing world.

发展中国家的第一个艾滋病毒哨点监测计划。

Then you may be sent to any part of the country as a sentinel and be expected to stick to your post for the rest of your two-year military service.

接下来，你有可能会被派到全国任何一个地方去当哨兵，并会在两年的军旅生活中一直坚守着这个岗位。

Journalists from The Milwaukee Journal Sentinel won for their reporting on how doctors worked to save a young boy who was struck with a mysterious disease that attacked his intestine.

《密尔沃基哨兵报》的新闻工作者则由于一篇医生竭力抢救一位患怪病而肠痛的小男孩的报道而获奖。

With the ease of use and patient benefits that sentinel lymph node dissections offer, this technique has become the standard of management for melanoma as well as breast cancer patients.

由于前哨淋巴结切除术容易施行且有利于病人痊愈，这项技术已成为治疗黑色素瘤及乳癌的标准程序。

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。

Other studies have already shown that tumor biology can change. One study, for example, showed that half of cancers change when they spread to the sentinel node.

我们的结果已经显示肿瘤生物学能发生改变。例如一项研究显示当癌转移到前哨淋巴结时有一半癌症发生变化。

I dare not quit my post, though an unfaithful sentinel, whose sure reward is death and dishonour, when his dreary watch shall come to an end!

虽说我是个不忠于职守的哨兵，等到这种沉网的守望终了的时候，我所能得到的报酬只能是不光彩的死亡，但我仍不敢擅离岗位！

Angiography is probably the procedure of choice for patients with sentinel bleed after PD, as it will localize the bleeding point and provide interventional embolization.

对于这些发生在PD术后的前哨出血，血管造影也许是合适的措施。因为它能找到出血点并能通过介入栓塞止血。