first come first served,subjected to availabilityfirst come first served,subjectedto availability连起来什么意思先来先得后面该怎么翻译好?

first come first served,subjected to availability
first come first served,subjectedto availability连起来什么意思先来先得后面该怎么翻译好?

供应有限
availability有货的意思

先到先得，恕不另行通知

先到先得，库存有限。