n(1) 水壩(barrier built across a river to control the flow of water) [C]：build a～across the stream 在溪中筑壩;A new～was being built at the mouth of the valley. 山谷口正在筑水壩。the Aswan D～ 阿斯旺水壩;〖同〗barrier， wall;
(2)(水壩)水庫(body of water formed by such a barrier) [C]：The water-level in the～was low today.今天水庫的水位低。have a picnic by the～在水庫邊野餐;
v(1) 筑水壩于.……(build a dam on or across(a river， valley， etc)) [T+n， T+n+adv(up)]：～(up) a river/a river valley在河流/河谷里筑壩;〖同〗block， hinder;
(2) 筑壩堵住(keep back by means of a dam)[T+n， T+n+adv(up)]：～(up) the water筑壩蓄水;
dam up (v adv) 抑(克)制(vt)(fig)：～up one's anger/one's feelings/one's tears克制怒火/控制感情/忍住眼淚;
【注意】dam與damn(v 詛咒;指摘;n 詛咒;毫(不))的讀音完全相同，注意不要弄混，如：The river may be dammed.(那河上可能要筑壩。) The play may be damned.(那出戲可能要受到批評。) Sinners may be damned to everlasting hellfire.(罪人會永世被詛咒。)