Be careful not to bump your head on the beam when you stand up.
当心站起来时头别撞了横梁。
《牛津词典》
2
Be careful you don't knock your head on this low beam.
小心，别把头撞在这矮梁上。
《牛津词典》
3
Off to Bydgoszcz. At night, tenting a blanket over his head to hide his flash light beam from the Valley Forge duty officer, Salinger (by now called Jerry) had written his first short stories.