Its moisture retention, hygroscopicity and antimicrobial activity were investigated.是什么意思？

Its moisture retention, hygroscopicity and antimicrobial activity were investigated.

研究了它的吸湿性 、 保湿性及抗菌性能.

its

pron. (it的所有格形式)它的，厥；

例句
The government is to accelerate its privatisation programme.
政府将加快其私有化计划的进程。

moisture

n. 水分，湿气，潮湿，降雨量；

例句
Plants absorb carbon dioxide from the air and moisture from the soil...
植物从空气中吸收二氧化碳并从土壤中汲取水分。

retention

n. 保留，记忆力，保持力，滞留，扣留，闭尿；

例句
They supported the retention of a strong central government.
他们赞成保留一个强大的中央政府。

hygroscopicity

收湿性；

例句
Using antiphase suspension polymerization to synthesize the high hygroscopicity resin.
采用反相悬浮聚合法合成高吸水性树脂.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

antimicrobial

n. 抗菌剂，杀菌剂；adj. 抗菌的；

例句
TRPV 1 agonist. Analgesic. Has antifungal, antimicrobial and antioxidant properties.
TRPV1收缩剂. 止痛剂. 具有抗真菌 、 抗微生物和抗氧化特性.

activity

n. 活动，活跃，敏捷，活动力，教育活动；

例句
Budding linguists can tune in to the activity cassettes in French, German, Spanish and Italian.
崭露头角的语言学家们可以收听法语、德语、西班牙语和意大利语的活动磁带。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

investigated

v. 调查( investigate的过去式和过去分词 )，审查，侦查，研究；

例句
He was being investigated for receiving bribes.
他因收受贿赂正在接受调查。