It will never be entirely flat because of the shape of the crotch seam, so I designed a bag with an elastic opening at the top so it wouldn't be a problem.

它永远不会完全因为裆缝形状扁平的，所以我设计了一个在顶部弹性打开袋子，以便它不会成为一个问题。

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Base on the site observation and experimental research, the paper studied the top coal structure for the top coal caving mining in steep inclined seam sections.

在现场观测及实验研究基础上，对急倾斜水平分段放顶煤开采过程中顶煤体结构进行了研究。

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First, based on similar material model test, top coal cave-in characters in steep and thick seam were studied as well as failure law of main roof and features of surface subsiding.

首先利用相似模拟实验研究了急斜特厚煤层顶煤的冒落特征、顶板的破坏规律，以及地表下沉的特点。

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The seam between sleeve and the top of the suit lay flush with the rest of the arm, with no rope or ribbing underneath to hold it up.

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For his twelfth birthday, Sandy had gotten a large, flat black portfolio made of hard cardboard that folded along a sewn seam and was secured at the top edge with two attached lengths of ribbon that he tied in a bow in order to fasten the leaves.

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Shortly after lunch, skipper Dravid was out lbw for 11 to an angled ball from Nel as the South African seam attack tightened their grip, although TV replays suggested it would have cleared the top of the stumps.

BBC: SPORT | Cricket | India progress checked by weather