求翻译：入盛有18mL人工胃液的释放池中。恒温(37℃)持续搅拌下定时取样，同时补充等量人工胃液。用紫外可见分光光度计于266nm处测定样品中的羟基喜树碱含量，进而计算出羟基喜树碱的累积释放率。所有吸光度值均以未载药微球同样条件下的人工胃液为参比。是什么意思？

Artificial gastric juice containing 18mL into the release of the pool. Constant temperature (37 ℃) under continuous stirring time sampling, adding the same amount of artificial gastric juice. UV-Vis spectrophotometer at 266nm was measured in samples of HCPT content, and then calculate the cumulative

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Enters abundantly has in the 18mL artificial gastric juice release pond.Under the constant temperature (37℃) continually agitation fixed time takes a sample, simultaneously supplements the isometric artificial gastric juice.With the ultraviolet obvious spectrophotometer in 266nm place determination

In artificial gastric juices containing 18mL free pool. Constant temperature (37 ° c) sampled regularly under continuous mixing, adding equal amounts of artificial gastric juice. UV-Vis Spectrophotometers at 266nm determination of hydroxy camptothecin content in sample and calculate cumulative relea