1. The provincial health and disease control experts were still working to trace the source of the epidemic in the county with 1m people.
2. The provincial health and disease control experts were still working to trace the source of the epidemic in the county of 1 million people.
3. It enables the company to trace the source immediately in case of a problem.
4. An expert group has been sent to Dongguan to help with the medical treatment, placate patients'families and trace the source of the flu.
5. He said it's difficult to trace the source of the scallops because Hong Kong buys most of its shellfish from Guangdong.
6. The county government had asked Shandong to help trace the pollution to its source.
7. NASA last year discovered metal shavings inside the mechanism and is trying to trace the source of the contamination.