摘要：
HELP FREQ ALL % MI 1 ITS 170 1139454 0.01 3.55 2 THEIR 165 2417479 0.01 2.42 3 PERCENT 60 357658 0.02 3.72 4 STATES 60 396967 0.02 3.57 5 UNITED 57 29 阅读全文
摘要：
HELP FREQ + ALL % MI 1 HE 134 6468127 0.00 1.45 2 HIS 105 3761571 0.00 1.88 3 THEIR 93 2417479 0.00 2.35 4 HOW 75 1667379 0.00 2.57 5 WHO 47 2510613 0 阅读全文