transect line meaning in English

样线

As it is impossible to lay the transect line exactly the same location every year , small variations in the coverage is expected
由于没可能每一年都把基线放在完全相同的位置上，所以有偏差是可以预料的。
Coral reef fish and invertebrate species such as butterfly fish , groupers , wrasses , lobsters , sea urchins , and the coverage of hard coral species are quantified around a transect line placed in a similar position every year
每年普查均会在相同位置展开基线，统计如鲽鱼石斑鹦鹉鱼虾海胆等的珊瑚鱼和无脊椎动物的数目，以及珊瑚的覆盖率。