The most convincing explanation is that when someone is finding it difficult to understand what is said to them, he/she engages in a form of lip-reading: he/she will observe the lips of the talker and mimic the talker's lip movements.
Lake Tanganyika is an African Great Lake. It is estimated to be the second largest freshwater lake in the world by volume, and the second deepest, in both cases, after only Lake Baikal in Siberia; it is also the world's longest freshwater lake.
750. 229. The deepest lake in the world is Lake Baikal in Siberia. Its deepest point is 1637 meters. It holds 20% of the world's fresh surface water and is the world's largest freshwater lake by volume.50. 229. The deepest lake in the world is Lake Baikal in Siberia. Its deepest point is 1637 meters. It holds 20% of the world's fresh surface water and is the world's largest freshwater lake by volume.