VOA慢速英语:'William Wilson,' by Edgar Allan Poe, Part Two

lighthearted - adj. having or showing a cheerful and happy nature

perhaps - adv. possibly but not certainly

height - n. a measurement of how tall a person or thing is

likeness - n. the quality or state of being alike or similar especially in appearance

schoolfellow(s) n. - a more formal word for schoolmate or classmate

tremble(d) - v. to shake slightly because you are afraid, nervous or excited