天火字典

英日字典：ししえいえい

ししえいえい

孜々営々

孜孜営営

孜々営々：

(adj-t,adv-to)
assiduously
with unremitting zeal
孜孜営営：

(adj-t,adv-to)
assiduously
with unremitting zeal

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