慢慢地、逐渐地

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slowly	adv. 慢慢地
gradually	adv. 逐步地、渐渐地
stage by stage	adv. 逐步地
step by step	adv. 逐步地、一步一步地

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slowly

slow	adj. 慢的
slow	v. 变慢、放慢
slowness	n. 缓慢

gradually

gradual	adj. 逐渐的、平缓的