The steel industry has changed radically over the last two decades, as large, integrated companies such as Bethlehem Steel once conducted operations from mining at one end of the process to shipping at the other have greatly downsized, or in some cases shut down altogether.
once conducted .....have greatly downsized...... or......
run-onas....that ...once conducted.....have greatly downsized, or....
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Amytanh22020-10-05 07:23:45
句意其实such as Bethlehem Steel是个插入语,that引导的是companies的同位语从句。如果没有that,后面句子是形容Bethlehem Steel。