然而就是在本世纪上半叶，人们还是以出身来定贵贱。
Yet even in the first half of this century people used to be classed according to their birth.
在本世纪上半叶，科学家仍然认为，细胞是一个相当简单的原生质斑块。
In the first half of this century, scientists still assumed that the cell was a fairly simple blob of protoplasm.
核实本世纪上半叶的累积排放量，并将排放额度分解到各个国家和地区是一项十分艰巨且很迫切的任务。
Verifying the cumulative emissions in the first half of this century and breaking emission quotas down to all countries and regions is a very tough and urgent task.
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