usual: [14] That which is usual is etymologically that which is commonly ‘used’ or employed, or which commonly obtains. The word was acquired, probably via Old French usual, from late Latin ūsuālis, a derivative of Latin ūsus (source of the English noun use). => use
usual (adj.)
late 14c., from Old French usuel "current, in currency (of money), valid" (13c.) and directly from Late Latin usualis "ordinary," from Latin usus "custom" (see use (v.)). The usual suspects is from a line delivered by Claude Rains (as a French police inspector) in "Casablanca" (1942).
权威例句
1. The first snow came a month earlier than usual.
第一场雪比往年提早了一个月。
2. They have the usual quota of human weaknesses, no doubt.
毫无疑问,他们身上也有人所共有的弱点。
3. Instead of moving at his usual stately pace, he was almost running.
他没像平时那样优雅庄重地走着,而是几乎跑了起来。
4. It is a neighborhood beset by all the usual inner-city problems.
这是个为各种内城常见问题所困扰的社区。
5. It is usual to tip waiters, porters, guides and drivers.