说明
in the past few years (days) 与现在完成时连用 见 present perfect tense
past ⁴
in the past few years (days) 与现在完成时连用 见 present perfect tense $^{7,8}$
in the past few years (days) 与现在完成时连用 见 present perfect tense $^{7,8}$
in the past few years (days) 与现在完成时连用 见 present perfect tense