| 摘要 |
A dispensing apparatus to dispense at least one of a first substance and a second substance therefrom includes a head having a first inlet to receive the first substance therethrough, a second inlet to receive the second substance therethrough, and an outlet to expel a mixture of the first substance and the second substance therefrom, with the head configured to vary a ratio of the mixture between substantially all of the first substance and substantially all of the second substance. The dispensing apparatus further includes a first airless chamber to contain the first substance therein, with the first airless chamber fluidly coupled to the first inlet of the head.
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