All said the current spread raises the risk of the virus becoming a bigger threat to humans.

所有人都表示，目前的传播增加了该病毒对人类构成更大威胁的风险。

The currents spread, or circulate, water in the Atlantic Ocean, the U.S. National Oceanic and Atmospheric Administration (NOAA) explains.

美国国家海洋和大气管理局（NOAA）解释说，洋流在大西洋中输送或循环。

But this negative activity is rapidly overwhelmed by current spreading through the left ventricle.

但是这种负性活动很快被通过左心室的电流所淹没。