I wouldn't use them interchangeably. If something is twofold, it has two steps or parts as in a twofold solution. On the other hand is an expression we use to introduce a contradiction or alternative: if we buy the less expensive freezer, we will save money now; on the other hand, we may spend more in the long run by having higher energy costs. The two terms cannot be used interchangeably in these sentences.
Duplex is Latin for "double". It literally means "twofold".
On The Other Hand
Other words for "twofold" (also two-fold) are dual, double, paired, coupled, or twin. (e.g. a twofold reason for proceeding)In math, a twofold increase simply means that a rate has doubled.
Duplex commonly means double or twofold. It can also mean a two floor apartment.
It doesn't mean anything. On the other hand, coger means to take, to take with the hand, to grab.
On the other hand.
However means on the other hand or in spite of that.
but, on the other hand, however, moreover, also
It might but on the other hand it may only mean that they are sexualy adveturous and inimpresed by convention.
twofold doubleheader
A message that contains two meanings.
The twofold nature of man refers to the idea that humans possess both physical and non-physical aspects. The propositions you mentioned may not be contradictory because they could be addressing different aspects of this twofold nature - one focusing on the physical aspect (body) and the other on the non-physical aspect (soul or mind). Alternatively, they could be seen as complementary rather than contradictory, illustrating the complexity of human nature.