Subject + 掌握 + 了 + Object
The verb 掌握 (zhǎngwò) means 'to master,' 'to grasp,' or 'to have command of.' It describes gaining thorough understanding or control of a skill, technique, or body of knowledge. For example, 掌握了使用新力量的方法 means 'mastered the method of using the new power.'
她花了两年时间掌握了法语。
tā huā le liǎng nián shíjiān zhǎngwò le fǎyǔ.
She spent two years mastering French.
你需要先掌握基本技巧,再学高级的。
nǐ xūyào xiān zhǎngwò jīběn jìqiǎo, zài xué gāojí de.
You need to master the basic skills first before learning advanced ones.
他已经完全掌握了这门新技术。
tā yǐjīng wánquán zhǎngwò le zhè mén xīn jìshù.
He has completely mastered this new technology.