adv.向上游;逆流地;
例句:
1、
As upstream pressure increases, the diaphragm pushes against the spring.
当上游压力增加, 隔膜就像弹簧施加推力.
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2、
This process continued at the same time constant and waterfalls are also to move upstream.
这一过程不断继续的同时,瀑布亦向上游移动.
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3、
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