The workload of a person or organization is the amount of work that has to be done by them.
例句
The sudden cancellation of Mr Blair's trip was due to his heavy workload...布萊爾先生因為工作繁重而突然取消行程。This office's resources and staff would have to be increased to cope with the extra workload.要應付額外的工作，必須增加這個辦公室的資源和人手。