Translation of "extremely small" into Chinese

The mustard grain was tiny and so it could be used to designate anything extremely small.

芥籽是十分小的种子,可以用来指任何非常微小的东西。(

Furthermore, specific earmarkings and other conditions are often confirmed late and are sometimes for extremely small proportions of total project budgets

而且,专门指定的用途和其他条件常常很迟才确认,有时只是总体项目预算的极小部分。