The acronyms in the generic template above refer to the Target Language - 'TL' ( the language being studied ) Presented by default.
Clicking once takes you to the Source Language - 'SL' where you can see the equivalent translated into your own language.
Clicking twice takes you to the Quiz - 'TLQ' where you need to reproduce the word ( or phrase ) that you've just seen at the 'TL' level.
Once you've correctly entered the corresponding text , that vocabulary item becomes visible on the curve - in its approximate respective position, relative to other words in that concept spectrum. It will stay there until you refresh the page.
Double clicking outside the Quiz dialogue box closes it so you can move on to the next vocabulary item.
You can choose to 'toggle' between the (default ) States Mode - and the Transitions Mode - where you'll be presented with the same curve - but this mode deals with the verbs , adverbs and verb phrases we use to describe the transitions that occur between the adjectives and nouns on the States Mode.
e.g. Cold ( State ) warming up ( Transition ) Warm ( State ) .
When you toggle to the Transitions mode you'll immediately see words along the curve. You can use your cursor ( or finger ) to drag them along the curve - and you can click on them once to get the translation - twice to do the test - with your correct entries being sent up to the the arrays on either side of the screen - where you can turn either the TL or SL version on or off - as another aid to help you to memorise them.