Today I want to talk about the importance of stars for early seafarers, about how the fixed patterns of stars were used as navigational aids.
今天我想谈谈恒星对早期航海者的重要性，以及恒星的固定模式是如何被用作助航工具的。
Non-governmental organizations, Fang Yi morning hearing will be fixed sources of funding, in-depth high-risk groups to promote the prevention of AIDS.
晨报讯 民间防艾组织将有固定的资金来源，深入到高危人群中推广预防艾滋病。
Secondly, grinding effect of every monomer grinding aids with fixed content on fly ash cement and slag cement is tested. The effect on the properties of fly ash cement and slag cement is also tested.
其次，本文研究了几种单体助磨剂固定掺量对粉煤灰水泥和矿渣水泥的助磨效果和对水泥性能的影响。
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