germ

在显微镜下，我们看到这种微生物开始繁殖。

Under the microscope, we watched the ___germ start to multiply.

这个简单的想法包含了整个项目的雏形。

This simple idea holds the ___germ of the entire project.

这个简单的计划只是后来发展成庞大项目的雏形。

The simple plan was just the ___germ of what later grew into a huge project.