有冇人幫我解一解呢段.. THX..

Informality is crucial to National's operating style. Because of the lean managerial staff, no one ever has trouble knowing whom to call when a problem arises. The only expensive-looking things in those executive offices are multibuttoned phone consoles, backed up with a system of WATS and tie lines, through which practically any National executive can reach practically any other. Written memos play a small part in National's communication flow.