The pedicle of tongue flap must maintain a fluent venous drainage canal.

舌瓣的蒂部必须保留一个较通畅的静脉引流渠道。

youdao

Every schoolchild here learns the legend of "the great Yu," whose prodigious feats of canal building and drainage ditch digging 4,000 years ago put an end to killer floods on the Yellow River.

这里的每一个学龄儿童都知道大禹的传说，他的伟大功绩在于4000年前修筑了河渠和排水沟，终止了当时黄河洪水的泛滥。

youdao

Every schoolchild here learns the legend of "the great Yu," whose prodigious feats of canal building and drainage ditch digging 4, 000 years ago put an end to killer floods on the Yellow River.

这里的每一个学龄儿童都知道大禹的传说，他的伟大功绩在于4000年前修筑了河渠和排水沟，终止了当时黄河洪水的泛滥。

youdao

Your surgeon inserts the tool into the eye's drainage canal through a small incision at the edge of the cornea and removes the small section of trabecular meshwork.

CNN: Glaucoma

It will use 12, 000 tonnes of stones and other materials to reconstruct the 235-year-old canal embankment and will also install new drainage.

BBC: Work starts to repair breached Trent and Mersey Canal