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1·A boundary marker is only a symbol.

界碑只是一种标识。

2·You thought the boundary marker means to be the boundary?

你以为界碑就是边界啊？

3·A boundary marker is only a symbol, not the exact boundary.

界碑只是一种标识，并不是真正的边界。

4·The Planners, moreover, renounced an obvious, structural boundary and relied on palms as a natural green marker.

而且规划师放弃一个显而易见的，结构性的边界，并以棕榈树作为一种天然的绿色标记。

5·So he concluded that the depth marker the boundary between the solid metal and the liquid core.

所提你提出这个深度是固体金属和液态核的边界。