Knowledge of darkroom techniques is required for this tutorial .

本教程需要有暗房技术知识作为前提。

Talk with your classmates about their study techniques .

跟你的同学对他们的学习技巧。

Another group received the same amount of tuition-11 hours-in basic relaxation techniques .

其它群体则接受11个小时的基础放松技能指导，同样为期一个月。

Investors should remember that all trading techniques sometimes work and sometimes they do not .

投资者应当记住，所有的交易手法都会有时行得通，有时行不通。

But those are top-down big brother techniques .

但这些应用技术都带有掌控和专制性质。