1·For the mediocre level and low level primary students, signal supporting strategy was the best choose.
阅读水平低的听觉障碍小学生使用标记辅助阅读效果最好。
2·JIT compilation removed the overhead of interpretation (at the expense of some additional startup cost), but the level of code optimization was mediocre for several reasons.
JIT 消除了解释的负担（以额外的启动成本为代价），但是由于若干原因，代码的优化等级仍然是一般般。
3·Unfortunately, in spite of the common belief, I think the average level of Google engineers is mediocre. With a lot of arrogance, too.
人们普遍认为，谷歌工程师是精英，但不幸地是，我觉得谷歌工程师的平均水平居中，而且态度傲慢。