This difference seems to be applied to explain the cause why the squeal only occurs in the end of the upward-stroke under reciprocating sliding.
这为解释往复滑动摩擦噪声只在向上行程末期发生的原因拓宽了视野。
参考来源 - 金属往复滑动条件下摩擦噪声与磨痕形貌关系的探讨·2,447,543篇论文数据,部分数据来源于NoteExpress
ADJ An upward movement or look is directed towards a higher place or a higher level. 向上的 [ADJ n]
She started once again on the steep upward climb.
她再次沿着峭壁开始向上攀爬。
She gave him a quick, upward look, then lowered her eyes.
她飞速地抬眼看了看他,然后又垂下双眼。
ADJ If you refer to an upward trend or an upward spiral, you mean that something is increasing in quantity or price. 上升的 (趋势、螺旋) [ADJ n]
...the Army's concern that the upward trend in the numbers avoiding military service may continue.
…军方对逃避服兵役者数量的上升趋势可能继续下去的担忧。
ADV If someone moves or looks upward, they move or look up towards a higher place. 向上
They climbed upward along the steep cliffs surrounding the village.
他们沿着环绕村庄的陡峭悬崖向上爬。
'There,' said Jack, pointing upwards.
“那儿,”杰克往上指着说。
ADV If an amount or rate moves upward, it increases. (数量、比率) 向上 ; 增涨 [ADV after v]
...with prices soon heading upward in stores.
…随着商店里价格迅速上涨。
Unemployment will continue upward for much of this year.
失业率今年大部分时间将继续上升。
PHRASE A quantity that is upwards of a particular number is more than that number. (某数字) 以上
It costs upwards of $40,000 a year to keep some prisoners in prison.
关押一些囚犯每年要花费4万美元以上。
She started once again on the steep upward climb.
她再次沿着峭壁开始向上攀爬。
Unemployment will continue upward for much of this year.
失业率今年大部分时间将继续上升。
The chopper shot upward in a manoeuvre matched by the other pilot.
这架直升飞机向上冲去,另一架飞机也以相同的移动方向冲了上去。
Other things including high fat diets and reduced physical activity are also believed to be pushing the numbers upward.
VOA: special.2009.03.02
So, according to the expectations theory augmented with liquidity preference-- This strongly upward-sloping term structure in 2003 would reflect two things.
所以,根据结合了流动性偏好的,预期理论,2003年期限结构中表现出的,强烈上扬趋势反映了两方面的因素
Then the--so the term structure was downward-sloping until about two and a half years and then it was upward sloping.
期限结构线先向下倾斜,在到期期限过了两年半的时点后,才缓慢回升
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