"使向一点会合" can be translated into English as "to converge at a single point" or "to cause to converge at one point", depending on the context.
"To converge at a single point" emphasizes the action or result of moving towards and meeting at one specific location.
"To cause to converge at one point" highlights the act of making something (e.g., lines, paths, or forces) move towards and meet at a single point.
For example:
The paths of the two runners will converge at a single point on the track. （两位跑者的路线将在跑道上的某一点会合。）
The forces are being adjusted to cause them to converge at one point. （正在调整这些力，使它们向一点会合。）