The baby was sucking milk from its mother.

婴儿在吸母亲的汁。

The baby was sucking its mother's breast.

婴儿正在吸母乳。

The baby was sucking away at the empty feeding-bottle.

那个孩子正在吸着空。

Bacula memo: It comes by night and sucks the vital essence from your computers.

随着黑夜而来临，吸你计算机上生的数据。