Five viable pregnancies were established.是什么意思？

Five viable pregnancies were established.

已确定5个胎儿能够成活。

five

num. 五，五个，与某人击掌问候（或庆祝胜利），第五；n. 五，五个，5美元钞票，[板]得五分；adj. 五的，五个的；

例句
I'm just checking up on Kim. It'll take me all of five minutes.
我只是要督促一下金，总共也就需要5分钟。

viable

adj. 切实可行的，能养活的，能自行生产发育的，有望实现的；

例句
...a viable programme of economic assistance...
切实可行的经济援助方案

pregnancies

n. 怀孕，妊娠( pregnancy的名词复数 )；

例句
In the world as a whole, about ten per cent of all pregnancies are terminated.
从全世界看来，所有怀孕的人中约 10% 的妊娠被终止了。

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。

established

adj. 已建立的，已设立的，已制定的，确定的；v. 建立（ establish的过去式和过去分词），确定，[植物学]使（植物）定植，使成为；

例句
Forster established the essentiality of minerals as accessory food factors required for maintaining life.
福斯特证实了矿物质作为辅助食物因子在维持生命方面的重要性。