Help write a description of tower crane's delay in construction period

Description of construction delay of tower crane

Due to the needs of the project, we rented a tower crane from the tower crane company. The contract stipulated that the goods should be delivered to us on July 20th, but they still could not be delivered to us on August 20th. During this period, we had to rent a truck crane for construction, but the efficiency was low, which delayed our construction period and cost XX yuan.

Hereby explain!

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