必须在两个系统之间发送的数据量只受到日志记录的操作的限制。
The amount of data that must be sent between the systems is limited to only logged operations.
而口内测量由于操作的限制，很难实现对一定时期内牙磨耗量的精确测量。
Confined by the operation condition, intra-oral measurement can't make a precise result of tooth wear in a period.
要减少机器的操作，就应该限制它们的生产，从而降低损害。
Reduced operation of the machinery should limit their production and thereby constrain the damage.
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