中国每年将10%的观测时间（约450小时）交给其他国家的科学家。
China is giving 10% of its observation time, around 450 hours a year, to scientists from other countries.
偶极子云的问题是在通过单基地雷达观测时有效散射截面。
The problem of the dipole cloud is an effective scattering cross-section while observed by a monostatic radar was studied.
对于获得更新更大的8米级望远镜或者哈勃太空望远镜的观测时间仍具有挑战性。
Obtaining observing time on one of the newer, more powerful 8-meter telescopes or on the HST was, and remains, more challenging.
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