closed outer boundary
... 油藏外边界 outside pool boundary 封闭外边界 closed outer boundary 外边界区 external boundary region ...
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微软做得很好，当光标接近封闭的滚动框内边界，而不是外边界时才发生滚动，这样的自动滚屏的想法的确非常聪明。
To their credit, Microsoft's idea of auto-scrolling as the cursor approaches the inside edges of the enclosing scrollbox, rather than the outside, is very clever indeed.
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