It was necessary to discover the truth or otherwise of these statements.

有必要查证这些说法是否真实。

The police must have a search warrant to search a house.

警察要搜查一座房屋必须有搜查证。

By the engineering checking of the selected target section we found the gold mine in both prospecting trench and randing, and gained 1.5t gold resource.

通过对优选靶区的工程查证，探槽、井双双见矿，共获得黄金资源量1.5吨。