bbc英語聽力練習：Great Barrier Reef under threat

delegation
    people sent to act as representatives
    mining
    process of digging into the ground
    expansion
    the process of spreading out
    coal
    black rock used for energy
    imposed
    put into place
    marine
    relating to the sea
    ensure
    make certain
    suspend
    stop for a short time
    review
    report into something
    carried out
    made to happen