You use alternatively to introduce a suggestion or to mention something different from what has just been stated.
Hotels are generally of a good standard and not too expensive. Alternatively you could stay in an apartment.
旅馆一般标准高并且不太贵。或者你可以住公寓。
Allow about eight hours for the drive from Calais. Alternatively, you can fly to Brive.
从加莱驾车至此大约需要八小时。或者您也可以乘飞机到布里府。