沉积
sediment; deposit; sedimentation (geology)
趁机
to seize an opportunity; to take advantage of situation
陈迹
past events; relics from a former age; ruins
沉积作用
sedimentation (geology)
沉积岩
sedimentary rock (geology)
沉积带
sedimentary belt (geology)
海相沉积物
oceanic sediment (geology)
良辰吉日
fine time, lucky day (idiom); fig. good opportunity