indispensable

a.不可缺少的

indignantly, indignation, indignity, indigo, indirect, indirect object, indirect question, indirect speech (also reported speech), indirect tax, indirectly, indirectness, indiscernible, indiscipline, indiscreet, indiscreetly, indiscretion, indiscribable, indiscriminate, indiscriminately, indispensability, indisposed, indisposition, indisputable, indisputably, indissolubility, indissoluble, indissolubly, indistinct, indistinctly, indistinctness, indistinguishable, indistinguishably, indium, individual, individualism, individualist, individualistic, individualistically, individuality, individualize,