本期内容：

Satellite mapping of sea-surface heights sug*ests that the strong El Niño weather phenomenon resembles that of 1997-98, one of the strongest on record, according to America’s space agency, NASA. The current El Niño has been blamed for droughts and flooding around the world, and unusually warm weather in the northern hemisphere.

词义解析:

Satellite mapping: 卫星地图

Resemble：与……相似

Drought: 干旱

Hemisphere：半球