1-watershed 流域

2-underscore 突出显示，强调

3-driver 驱动力

4-waterway 水路，航道；排水沟

The Panama Canals watershed experienced its fifth driest year of the last seven decades in 2019, officials said, underscoring warnings that climate change poses a major challenge to the recently expanded waterway, a major driver of central American nations' economy.

5-precipitation 降水量

The annual report of the authority said that the watershed received 84.6 inches of precipitation last year, 20% below the historic average of 106.1 inches.

6-stretch （连续的）一段时间

The watershed has seen the driest three-year stretch on record as well as 8 of the 10 biggest storms.

7-undergo 经历，经受（变化，不快等）

8-accommodate 容纳

9-cargo 货物，负重

The canal underwent a multibillion dollars expansion with the opening of new locks in 2016 to accommodate larger, new panamax-class ships capable of carrying far more cargo than the biggest vessels that were previously able to transmit the waterway.

10-spell （某种活动，天气，疾病等）的一段时间 ；魔咒

In early 2019 authorities implemented drafting restrictions for vessels due to low water levels amid a severe dry spell, forcing large ships cross with below capacity cargo loads and lowering revenues.

11-interoceanic 大洋之间的

Water levels have fallen again during the current dry season at Gatun Lake, through which ships cross on the interoceanic voyage, though experts say it is too early to tell if drafting restrictions will again be necessary this year.

12-reservoir 水库

13-channel （通过管道）输送

Canal authorities expect to finish various studies around midyear on proposals to build new reservoirs and channel water from other sources to the lakes.