Time of calving varies with class of country.

由于各地条件不同，产牛犊的时间也不同。

youdao

Something happens to your sense of time here: It compresses like the crystals of blue ice, then falls away like a calving glacier.

FORBES: Go with the Floe

Sequential optical images of high spatial resolution were used for the first time to derive surface ice velocities of Glaciar Upsala, a fast-moving fresh-water calving glacier in southern Patagonia.

UNESCO: Dublin Core