VOA慢速英语:干旱影响巴拿马运河航运

drought – n. a long period of time during which there is very little or no rain

lock – n. an area in a canal or river that has gates at each end which are opened and closed to control the level of the water in different sections of the canal or river as boats move through it

artificial – adj. not happening or existing naturally : created or caused by people

precipitation – n. water that falls to the ground as rain, snow, etc.