We are responsible to replace the defective ones.
It‘s really something wrong with the quality of this consignment of bicycles.
I regret this quality problem.
We hope that you’ll pay more attention to the quality of your goods in the future.
The workings of these machines are inaccurate.
Upon arrival， we found the shipment of wool was of poor quality.
The quality of the fertilizer is inferior to that stipulated in the contract.
The quality of this article cannot qualify for first-class.
If you find the quality of our products unsatisfactory， we‘re prepared to accept return of the rejected material within a week.
More than 300 watches are not up to standard.
Words and Phrases
bad quality 劣质
low quality 低质量
inferior quality 次质量
to be responsible for 对。..负责
poor quality 质量较差
to be inferior to 次于。..