Sentence:  In Australia, 1 <WSD>tablespoon</WSD> equals 20 ml, and there are 4 teaspoons in the Australian <WSD>tablespoon</WSD>. 
Meaning of the word marked with <WSD> tags:  A unit of volume, the value of which varies regionally; "in the US: three teaspoons or roughly 15 ml; in Britain and Canada: exactly 15 ml; in Australia: four teaspoons or 20 ml".