The three sections of Bei Dao's affecting new book of poems, Old Snow --"Berlin," "Oslo," "Stockholm"--are poignant reminders of the restless and rootless life of the exile. All the poems in the present bilingual volume were written post-Tiananmen Square (June 4, 1989), and the poet refers back to this watershed both overtly ("Not your bodies but your souls/ shall share a common birthday') and in dense images of loss and betrayal ("old snow comes...