EMC is the difficult point of industry.

EMC是业界的一个难点；

Transformational robbery crime in judicatory practice is the difficult point.

摘要转化型抢劫罪在司法实践中属于难点问题之一.

The teaching of pattern is both focal point and the difficult point.

图案教学既是重点又是难点。

The Japanese honorific is always the difficult point for Chinese learners.

日语敬语学习一直是困扰中国学习者的难点.

It is the difficult point to seek techniques not only according to judgement standards but also not contrary to rules.

寻求既符合裁判员判罚标准、又不违反规则要求的竞走技术，将成为竞走技术训练的难点。

Knock threshold detection is the key of closed loop control of ignition in gasoline engine, and it is also the difficult point in knock measurement.

汽油机爆震边缘检测是汽油机点火闭环控制的前提，也是爆震检测的难点。

Because of the special shape of the chuck, how to construct the mechanical model of the chuck is the difficult point of performance analysis of rapid fixture.

由于夹头的形状特殊，建立夹头的力学模型是快速夹具性能分析的难点。

The beam-column joint not only is the key of the aseismic design for reinforced concrete frame, but also is the difficult point of the aseismic strengthening for the CFRP sheet frame.

梁柱节点是钢筋混凝土框架抗震设计的重要部位，也是碳纤维布框架抗震加固的难点和重点。