Her illness kept her away from work for several weeks.
她因病数周未上班.
关于keep off,你给的解释是"站在远处",其实就是"不接近,避开"的意思.那么:
They lit a fire to keep wild animals off.
他们燃起篝火防止野兽接近.
The notice said "Keep off the grass".
布告牌上写著"勿踏草地".