двуслойный
bistratosus [a, um];
углубление
lacuna [ae, f];
кстати
commode; opportune; obiter;
impedire [4] ; obstare [1] ; officere [io, feci, fectum]; obstruere [o, uxi, ctum]; obstrepere [o, ui, itum]; remorari [or, atus sum] ; tardare [1] ; claudere [o, si, sum]; intercludere;