麻烦请翻译以下一句成英文

During the last mold trial,the black strips on top case have been efficiently improved. so please arrange once more trial.

在注塑模具中, 黑纹,不知你说是哪种情况,

有black flow marks, 就是black strips.
有black marks, black dots.black injecting marks. 等. 大家都在明白模具,因此,the last mold trial, 说, the last trial, 或test, 或说, the latest trial.

The problem of black lines appearing on the upper cover was solved to some degree by the last mode test. We will do the mode test again in some time.

Through the last test mode, and Wen appear above the question of a significant improvement. About time to try again