It is calving season in the Arctic.

这是北极圈的裂冰季节。

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。

At the range gate, I saw the cow suffering from calving.

我在牧场门口看到一只牛忍受着生产的痛苦。

Electric fencing now surrounds calving lots in many risky areas.

现在许多危险区域的生育场地都有电网围护。

Calving: the breaking off of an iceberg from a glacier or ice shelf.

冰裂：冰山从冰川或冰架上断裂下来。