Prestratigraphy
前地层学
🗣️ 情景例句
Shopping vouchers are ofter a good means of attracting customers.
购物优惠券是吸引顾客的好方式。
Any time.
随时都愿意效劳。
Workers will have completed the new roads by the end of this year.
工人们将在今年年底前把新路铺好；