这种病发生在眼部排水渠道完全堵塞时，而且症状明显——视力模糊、头痛、眼痛并作呕。
This happens when the drainage canals become completely blocked, and symptoms can be vivid - blurred vision, headaches, eye pain and nausea.
最常见的是开角型青光眼（open-angle glaucoma）。 患这种病的眼部排水渠道被部分堵塞。
The most common is primary open-angle glaucoma, in which the eye’s drainage canals are partly clogged.
城市其他老城区的排水渠道和排水设备有有了进一步的提高，这些设施直到被2005年卡崔娜飓风淹没之前，一直运转良好。
Further improvements in drainage canals and pumping equipment in the older sections of the city were also made. These operated well until they were overwhelmed by Hurricane Katrina in 2005.
他说：“网格中有一些间隙，在这些间隙里交叉着很小的自然排水渠道，而这些线条本身却没有完全被充填，有着许多小的条纹和不均匀的覆盖范围。”
They have gaps in them where they cross little natural drainage channels and the lines themselves are not perfectly filled in, with lots of little streaks and uneven coverage.
曾经作为城市主要水源的洛杉矶河，现在是一条混凝土渠道，用于暴雨排水渠。
24once the city's main water source, the Los Angeles River is now a concrete channel fed by storm drains.
为安装水管所进行的渠道开挖的工程量所用的计算规则条目，与为排水渠所开挖的工程量是相同的。
For example trench excavation for plumbing pipes are governed by the same rules of measurement as trench excavation for drain pipes.
这危险将增加的成本和'困难钻研'需要排水渠及渠道。
This danger will add to the cost and difficulty of 'delving' needed drains and channels.
这危险将增加的成本和'困难钻研'需要排水渠及渠道。
This danger will add to the cost and difficulty of 'delving' needed drains and channels.
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