WWhich two elements should be included with each visual aid in a technical document?
Well, using my limited knowledge, "cleaving" means to chop, break in half, split, etc. Twain means twice. So, perhaps it's like "you've broke my heart in half", something along those lines? hopefully this helps you.
I’d say común and popular
Since the rotational is exactly the same as the orbital period, the same portion of the moons sphere is always facing the earth