交感肾上腺系统不能维持直立位的脑灌注压。
The sympathoadrenal system is unable to maintain cerebral perfusion pressure in the upright posture.
这事经过如下：农忙时队长不叫我犁田，而是叫我去插秧，这样我的腰就不能经常直立。
It was so happened: during the rural busy season the team leader did not want me to plough instead he let me plant rice seedlings. Consequently I was unable to have my back straight very often.
这事经过如下：农忙时队长不叫我犁田，而是叫我去插秧，这样我的腰就不能经常直立。
It was so happened: during the rural busy season the team leader did not want me to plough, instead he let me plant rice seedlings. Consequently I was unable to have my back straight very often.
然而共同的祖先对于新人种又太现代，而不能作为来自非洲的人类首次远足的遗迹，那次远足产生了现在被称为直立人的爪哇猿人和北京猿人的祖先。
The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa, the one that led to Java man and Peking man, now known as Homo erectus.
读下去，你会学到如何挑选最好的圣诞树，还有如何放置它：直立起来，不能有半点倾斜；让树保持旺盛的生命力，能始终散发出松树特有的芳香；要让它远离任何可能的伤害——除此之外，本文还会告诉你一些假期之后如何清扫和布置装饰品的小窍门。
Read on to learn how to choose the best tree for you, put it up straight without a struggle, and keep it fresh, fragrant, and hazard-free —plus, secrets to holiday cleanup and ornament storage.
空袋不能直立。
藤本植物是指不能自由直立生长，需要借助于其他植物或支撑物的支持才能向上生长的植物的总称。
Vines are a group of plant that cannot stand erectly by themselves; they need to draw support from other plant or backstop to grow upwardly.
当交感肾上腺系统不能维持直立位的脑灌注压时，就会发生直立不耐受。
Orthostatic intolerance results when the sympathoadrenal system is unable to maintain cerebral perfusion pressure in the upright posture.
即使人类已经直立行走百万年了，我们的脚和背部仍然与两腿行走的压力抗争，不能轻易地抵抗巨大肢体强加上反复的压力。
Even though humans have been upright for millions of years, our feet and back continue to struggle with bipedal posture and cannot easily withstand repeated strain imposed by oversize limbs.
在泵站进口处加设短直立墙，并不能有效的改善水流的流态。
The short vertical wall have no affection to improve the flow pattern of outlet.
在泵站进口处加设短直立墙，并不能有效的改善水流的流态。
The short vertical wall have no affection to improve the flow pattern of outlet.
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