求翻译：基于经验模型的RSSI定位算法可以达到较高的精度，但是当环境改变时，提前建立的离线数据库可能会失效,而更新数据库需要大量的测试工作，这就使得该算法的应用受限；是什么意思？

The rssi positioning algorithm based on the empirical model can achieve higher precision, but when the environment changes, ahead of the offline database may fail, and update the database requires a lot of testing, which makes the application of the algorithm is limited;

Experience-based model of RSSI positioning algorithm can achieve a high degree of accuracy, but when the environment changes, the pre-established off-line database may be invalidated, and update the database needs to be a lot of testing, this makes the algorithm of the application is limited.

May achieve the high precision based on the experience model RSSI localization algorithm, but works as when environment change, establishes ahead of time the off-line database possibly can expire, but renews the database to need the massive test work, this causes this algorithm the application to li

RSSI localization algorithm based on empirical model can achieve higher accuracy, but when the environment changes, established in advance off-line database would be ineffective, and update the database requires a lot of testing, which enables the algorithm to apply restricted;

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