1‘a task requiring great patience and total concentration’
close attention, close thought, attentiveness, application, industry, assiduousness, single-mindedness, absorption, engrossment
2‘this concentration of effort on field work’
focusing, centring, centralization, direction
3‘Islay is famous for its spectacular concentrations of barnacle geese’
gathering, cluster, mass, flock, congregation, assemblage, assembly, collection
accumulation, aggregation, agglomeration
We take a look at several popular, though confusing, punctuation marks.