But while higher is better from a fuel conservation perspective, there is an upper limit on how high it is safe to orbit humans for long periods.

越高耗费的燃料越少，而载人飞船能够长时间安全飞行的轨道高度就有上限。

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In addition, setting relative index upper limit can preferably suppress the behavior of bidding high price in short of capacity.

另外，通过设置经济持留相对指标上限，可以较好地抑制发电商在容量短缺时报高价的行为。

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Reaching an intraday high of $54.60 means the upside target at $54.75 (upper limit of the current 'locking' range and the high of 2009) is very much on the cards to be challenge soon.

达日内高点$54.60，表示上升目标为$54.75（目前管道范围上限，并为2009年高点），此位置将会被挑战。

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Reaching an intraday high of $54.60 means the upside target at $54.75 (upper limit of the current 'locking' range and the high of 2009) is very much on the cards to be challenge soon.

达日内高点$54.60，表示上升目标为$54.75（目前管道范围上限，并为2009年高点），此位置将会被挑战。

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