理解
 intelligible 可理解的
 evident 明白的 the happy couple's love for each other is evident
 explicit 明确的、清楚的 the new tax law is explicit/that type of certificate is tax exempt
 elusive 难懂的 the boy was annoyed by the elusive words while reading the story
 mysterious 神秘的，难以理解的
 ignorant无知的，不了解的 he who is ignorant of the situation can't really understand me
 ignorance 无知
 grasp 领会、理解 it is said you do not need to have a grasp of english language to test well
 comprehend 理解 i could not comprehend the instructions for operating the computer
 comprehensive 综合的、有理解力的 a comprehensive survey was used to determine public opinion