DHAKA, Sept. 21 (Xinhua) -- The 11th Asian Tourism Fair was held in Dhaka from Thursday to Saturday to boost the tourism industry. More than 100 tourism companies and institutions from eight countries ...

在此，我们表明使用新提出的紧急约束（EC）来约束模型预测，可以在全球范围内将核心干旱指标——最长年度干旱期（LAD）——预测的不确定性降低10%—26%。经EC校正后的预测结果显示，与目前预测的未来作用力情景相比，LAD的平均增幅将高出42%—44% ...

not want to show that they were unsure of when I came, and finally give their best guess, which would normally be 2 hours, as that seemed to be a good amount of playing time for a high school student.

引力波探测器使用数公里长的干涉仪来测量时空的微小膨胀和收缩。由于量子力学的原因，这些测量的精度是有限的。理论上，利用光的压缩态可以超越量子极限，而合适的滤光腔可以在更宽的频率范围内扩展这一优势。