Then, in the Middle Ages, engineers discovered that such supports would last even longer if their downstream side was also shaped to offer little resistance to the current.
然后，在中世纪，工程师发现这些桥墩在下游这一侧如果也建成对水阻力比较小的形状，桥墩寿命还要延长。
Copper tubing shall not be used on the downstream side of the backflow preventer.
在防回流阀的下游不应该安装铜管。
Simultaneously, some rather instable rock masses were formed in some parts of the upstream and downstream side-walls of the main machine hall.
同时，在厂房上下游边墙的局部地段形成比较严重的不稳定岩体。
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