In 2019, 2020 and 2021 the sea ice was relatively stable and significant feather mounds were visible.
作为陕北革命老区首条高铁,西延高铁压缩时空,激活沿线经济,把老区纳入交通网。延安红色旅游、特色农业与西安科技、文创产业实现深度融合。
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Blue: AL CY Young Award winners
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