Vast tracts of the country are wild and undeveloped...乡间大片大片的荒地尚未开发。Each sequence is made of transgressive system tracts and highstand system tracts.认为娄山关组由7个三级层序组成,层序界面为古岩溶不整合面或暴露带,每个层序都由海进体系域和高水位体系域构成.Large tracts of w...
The spaceman will drive his moon car around to study the moon.宇航员将开着月球车到处考察月球.The spaceman flew through the galaxy at the speed of light.太空人以光速穿越银河系.Have you ever wanna be a spaceman?你曾经想成为一名宇航员 吗 ?...
The moon's gravity pulls the waters of the earth into a bulge.月球引力吸引地球上的水,形成涨潮....the pull of gravity.重力的牵引...the law of gravity.万有引力定律Armadillos aren't the only creatures who rely on gravity to get the ball ro...