Until you find that exact placement and exact pronunciation.

直到你找到准确的位置和发音。

The exact placement depends on who was doing the measuring.

准确的位置取决于谁在进行测量。

He then used a scanning process to set the exact placement of eight projectors to align everything with the light bulbs, rusted metal and tubes of the signs.

随后，他进行了扫描，确定8个放映机的精确位置，让放映机与电灯泡、生锈金属和灯管的位置吻合。