GUAN-3

('guan' in the third tone)

管 = tube, to manage

保管 = bao(3)guan(3) = to store and manage

保管箱 = bao(3)guan(3) xiang(1) = safe deposit box (e.g. in a bank)

Please note: when two third tones follow each other, the first of the two is spoken as a second tone. However, in Pinyin  with tone marks, tone changes are often not indicated, as this would make it difficult to identify the meaning of the respective Pinyin word. One just has to remember that if there are two third tones in a row, the first is spoken as a second tone.  

宝宝 = bao(3)bao(3) = baby

宝贝 = bao(3)bei(4) = jewelry, sweetheart

Please note: a third tone in the first place of a two-morpheme word or a two-morpheme expression is never spoken as a third tone. If it preceeds a first, second, or fourth tone, it is spoken as a so-called 'half third tone', which, technically, is only the falling first half of a third tone, but for simplicity could be considered a fourth tone.

管家 = guan(3)jia(1) = butler

血管 = xue(4)guan(3) = blood vessel