The most usual system is that of the decibel scale.

最常用的系统为分贝标度系统。

Which of these three pronunciations is the most usual?

这三种读法中,哪一种最常用?

The most usual lot is high-quality concrete slab – $73.

最常见的一类货物是这种高质量混凝土板，价值73美元。

Bench blasting is the most usual type of blasting work.

梯段爆破是最常用的爆破工程之一。

The most usual problems encountered in the structure handling are tautomerism, alternating and aromatic systems.

化学结构计算机处理中最常遇到的困难是互变现象 、 交替键和芳香键的处理.

Advertising competition is an important part of market competition, it is still the most usual competition tactic in market activity.

广告竞争是市场竞争的重要形式，亦是目前营销活动中经常选用的竞争策略。