"0"^^ . . . "0.5"^^ . . . . . "difficulty"^^ . . "difficulty"@en-us . . "104394770"@en-us . "a factor causing trouble in achieving a positive result or tending to produce a negative result; \"serious difficulties were encountered in obtaining a pure reagent\""@en-us . . "105686955"^^ . . . "05686955-n"^^ . "105358426"@en-us . . . . "a factor causing trouble in achieving a positive result or tending to produce a negative result; \"serious difficulties were encountered in obtaining a pure reagent\""@en-us . .