1. 还有一条古河道为东城东墙外的护城壕。
There are an ancient river retaining wall for the East Side East Moat.
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2. 城外修有护城壕。
There are security guards outside the city moats repair.
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3. 威尼斯建城于阿尔托岛，以威尼斯环礁作为巨型护城壕，藉此构筑天然要塞。
With the city itself perched on the Ri'Alto island and the Venetian Lagoon serving as a massive moat for the city, Venice is a natural fortress.
4. 护城壕
4. 进攻开始于11月18日凌晨的迷雾中，没多久，培根特遣队就打开了抵达护城壕的道路。
The assault began at dawn, November 18, in the fog. By noon Task Force Bacon had fought its way to the moat.