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。
In order to reduce the cost of personnel expense, the automatic control of the overhead crane system is developed.
为了减少人事的开销，天车的自动控制系统因而开发。
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