(1) alternately意为“轮换着，交替地，先是……然后……”。
- I'm alternately happy and depressed.
我一会儿高兴，一会儿沮丧。
(2) alternatively意思接近instead，意为“可以替换地，两者择一地”。
- It may have been because of the weather, or alternatively it may have been the result of indigestion.
这可能是因为天气所致，再不然也可能是消化不良引起的。
