短语讲解：
1. The Hawaii Pacific Tsunami Warning Center is responsible for issuing warnings to the state of Hawaii and American interests around the Pacific.
be responsible for对…负责
例句：She is responsible for sales promotion
她负责推销工作。
2. After the Indian Ocean tsunami of December 2004, the Pacific Tsunami Warning Center took on the role of monitoring the Indian Ocean as well, sharing this task with the Japanese Meteorological Agency.
take on承担
例句：He is always ready to take on heavy responsibilities.
他一向乐于挑重担。
3. Until then, there was no monitoring system in the Indian O
