To North Americans, the robins simply vacation in the south each winter.

对北美人来说，知更鸟只在南方过冬。

youdao

Each summer is hotter, each winter more bitter.

夏天越来越热，冬天越来越冷。

youdao

Ice typically covers the reservoir each winter and melts each spring.

每年冬季水库通常会结冰，而到了春季则会融化。

youdao

About twenty thousand brown pelicans fly south from the American state of Oregon each winter.

VOA: special.2010.03.02

U.S.officials worry that, even if the virus' spread is eventually contained, it could re-emerge months from now during the northern hemisphere's winter flu season, when more than 30,000 Americans die each year from common influenza.

VOA: standard.2009.05.03

Each winter Judith Caletti braced herself for the inevitable: crippling sinus headaches followed by an infection.

FORBES: Balloon Therapy

"One of the biggest burdens is the hundreds of hedgehogs we get each winter, " Miss Willers said.

BBC: Anonymous donor gives ?50k for new hedgehog hospital

It does, however, paint the dormant fairways green each winter, so that many resort visitors don't even notice.

WSJ: Why Brown Is the New Green | Golf Journal by John Paul Newport