fragment中等

Britain has relatively few butterfly species compared with mainland Europe and 80% are in decline, mostly because intensive chemical farming has reduced many species to tiny fragments of habitat and small nature reserves.

与欧洲大陆相比，英国的蝴蝶种类相对较少，而且其中80%正在减少，这主要是因为集约化的化学农业使许多物种只能栖身于零星的小块栖息地和小型自然保护区。

Norms have evolved and fragmented.

规范已经演变并变得多样零散。

Ground surveys allow archaeologists to pinpoint the places where digs will be successful. Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery. They often include a certain amount of digging to test for buried materials at selected points across a landscape. Archaeologists also may locate buried remains by using such technologies as ground radar, magnetic-field recording, and metal detectors. Archaeologists commonly use computers to map sites and the landscapes around sites. Two- and three-dimensional maps are helpful tools in planning excavations, illustrating how sites look, and presenting the results of archaeological research.

地面勘测使考古学家能够准确找出可以成功发掘的地点。大多数地面勘测需要大量步行，寻找诸如陶器碎片之类的地表线索。勘测通常还包括一定量的挖掘，在一片地域中选定的若干地点检测是否有埋藏物。考古学家还可以利用地面雷达、磁场记录和金属探测器等技术来确定地下遗存的位置。考古学家通常用计算机绘制遗址及其周边地貌的地图。二维和三维地图是规划发掘、展示遗址面貌以及呈现考古研究成果的有用工具。

fragments

碎片