His studies of ice-polished rocks in his Alpine homeland,
far outside the range of present day glaciers, led Louis agassiz in
1837 to propose the concept of an age in which great ice sheets
^^^^^^^^^
existed in what are now temperate areas.
^^^^
為什麼會有二個in 呢?分別是什麼功用?
which在這又是什麼功用呢?
謝謝
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