必携ひっけい
hi' kei

Suffix
no-Adjective

1. indispensable; essential; must-have

TOEICの学習がくしゅうかぎらず、英語えうごまなぶのであれば英和えうわ辞典じてん必携ひっけいしょひとつでしょう。
tōikkuno gakushū ni kagirazuēgō manabu nodeareba ēwajitenwa hikkēno shono hi. totsudeshō
An English-Japanese dictionary is surely a must have book, not just for those taking TOEIC, but for all studying English.
Noun

2. handbook; manual; vade mecum