usual conditions

基本解释

If you have no Good Luck now, it might be because you're under the usual conditions.
如果你时运不济，或许是因为环境一成不变的缘故。
rosehair83.blog.163.com
Under business-as-usual conditions, Egypt could face a 50 percent increase in greenhouse gas emissions from 2007 levels in the electricity sector alone.
如果不改变现状，埃及的电力部门本身就可能会使温室气体排放在2007年的基础上增加50%。
Under usual conditions, there is an inverse correlation between gene expression level and DNA methylation. The gene can be silenced by DNA promoter methylation.
通常情况下，基因表达水平与DNA甲基化呈负相关，基因启动子区域甲基化从而导致该基因沉默。

The deal has no financing contingencies, but is subject to the usual closing conditions.
FORBES: Seagate To Buy Samsung's Hard-Drive Unit For $1.375B
This camera is packed with useful features that not only cover tough shooting conditions, but usual situations, such as automatically detecting a pet's face (dogs and cats), and automatically capturing the shot at the best possible timing.
ENGADGET: Olympus Stylus TG-625 Tough adds AF light for tricky shots in rough situations