unrecorded

例句：

1. 1. Many immigrants have been unrecorded in the past.
   过去许多移民是未被记录的。
2. 2.The company's records show that the shipment was unrecorded.
   公司的记录显示，这次发货是未被记录的。
3. 3.The unrecorded history of this area is still being studied.
   这个地区的未被记录的历史仍在研究中。