(tōng, ㄊㄨㄥ) to go through; to know well; to connect; to communicate; open [CE-DICT]
常
(えいきゅう(永久)(P);とこしえ(永久);とわ) (adj-na,n,adj-no) (1) (とわ tends to be more abstract) eternity; perpetuity; immortality; (2) (えいきゅう only) Eikyuu era (1113.7.13-1118.4.3); (P) [EDICT]
(bào, ㄅㄠˋ) to crack; to explode or burst [CE-DICT]
大
(おお) (pref) (See 大・だい・2) big; large [EDICT]
(だい) (pref) (1) the large part of; (2) big; large; great; (suf) (3) approximate size; no larger than; (4) (abbr) (See 大学・1) -university; (n) (5) large (e.g. serving size); loud (e.g. volume setting) [EDICT]
(おおい) (pref) (1) (arch) (also written as 正) (See 従・ひろい) greater (of equal court ranks); upper; senior; (n,adj-na) (2) (See 大いなる,大いに) a great deal; very much [EDICT]
(おおき) (pref) (1) (arch) great; grand; large; (2) (also written as 正) (See 従・ひろき) greater (of equal court ranks); upper; senior; (n,adj-na) (3) (See 大きに) a great deal; very much [EDICT]