Under his leadership, many knotty problems were smoothly solved.是什么意思？

Under his leadership, many knotty problems were smoothly solved.

在他的领导下, 许多伤脑筋的问题都迎刃而解.

under

prep. 在…下面，在表面之下，在…的假定表面或掩饰下，少于，小于，在…情况下；adv. 在下面，少于，在水下，在昏迷中；adj. 较低的，下面的；

例句
...efforts to acquaint the public with their rights under the new law...
为使公众熟悉新法律所赋予的权利而作出的努力

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

leadership

n. 领导，领导的才能或能力，一群领导者，带路，指引；

例句
The calls for reform come as intense debate continues among the leadership over the next five-year economic plan...
领导层继续在为下一个五年经济计划激烈争论之际，有人发出了改革的呼声。

many

adj. 许多，多的；pron. （与复数动词连用）大多数人；

例句
There are many people who still find the act of abortion abhorrent.
仍有很多人对堕胎行为表示厌恶。

knotty

adj. （指木材）多结节的，多节瘤的，困难的，棘手的；

例句
The new management team faces some knotty problems.
新的管理团队面临一些棘手的问题。

problems

n. 问题( problem的名词复数 )，疑难问题，习题，思考题；

例句
There are two main problems which afflict people with hearing impairments...
听力有障碍的人们主要受到两大问题的困扰。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

smoothly

adv. 平滑地，流畅地，平稳地，顺利地；

例句
Whether does menstruate of the rice before menstruation adumbrate to come smoothly also classics?
月经前米有月经预兆是否也顺利来经?

solved

v. 解决( solve的过去式和过去分词 )，解答，解释，揭示；

例句
Mr. Hitchens said you have solved some very unusual cases.
希钦斯先生说您破过一些非常离奇的案子。