短語講解：
    1. A new study has found that the number of adults with diabetes worldwide has more than doubled since 1980 and now stands at nearly 350 million, many more than previously thought.
    stand at達到; 處于某種狀態(tài)
    例句：We stand at the portals of a new age.
    我們處于新時代的開端。
    2. Advanced statistical methods were then used to estimate the global prevalence of the disease.
    be used to do被用來做…
    例句：Cyanide is used to kill insects.
    氰化物可用來殺害蟲。
    3. The Taliban have strongly denied that they were responsible for a suicide car bomb attack that destroyed a hospital in eastern Afghanistan.
    be responsible for為…負責,形成…的原因
    例句：Everyone should be responsible for his work
    每個人都應對自己的工作負責。
    suicide car bomb attack自殺式汽車炸彈襲擊
    4. The Taliban denied that they were to blame, saying they didn't attack civilians.
    be to blame對某事應負責任的; 應受責備的
    例句：She was in no way to blame.
    絕不應該責備她。