sap

n. 半穿甲的(烧结铝粉);the liquid within a plant that carries food to all parts of it;a foolish person;v.to gradually weaken(somebody's strength);

Her long illness gradually sapped her strength.

长期的患病使她的体力渐渐衰竭。

The sap flowed out when he broke the stem of the flower.

他把花茎折断，汁液就流了出来。