大多数偷车贼是机会主义者、不熟练的小罪犯；许多人不到20岁。

Most car thieves are opportunist unskilled petty criminals; many are under 20.

youdao

有一次，在我还是个小毛孩，从来没有骑过马的时候，他让我骑上一匹马在他的旁边疾驰，对于他那不熟练的同伴，他一点也不担虑。

Once, when I was a mere lad and had never ridden a horse before, he made me mount one and gallop by his side, with no qualms about his unskilled companion.

youdao

他太缺乏经验且太不熟练，难以成功。

He was too inexperienced and too inexpert to succeed.

《柯林斯英汉双解大词典》

You could look at what it does but babies are not very coordinated or skilled so you need to use clever methods.

你可以观察婴儿,但婴儿不怎么配合,或者说他们的言语技能并不熟练,所以你必须要用精巧的方法才能做到

耶鲁公开课 - 心理学导论课程节选

It's reasonable, I think, to invoke Dr. Johnson here, Samuel Johnson, who writes in his Life of Milton that Milton's unskillful allegory appears to be one of the greatest faults of the poem.

我认为在这引用塞缪尔·约翰逊的话是很合理的，他一生都在写关于弥尔顿的文章,他指出弥尔顿不熟练的寓言成为了这部诗的大败笔之一。

耶鲁公开课 - 弥尔顿课程节选

Now we're in trouble and I say, don't run away! There are no techniques, there are no maneuvers, there are no -- you can't do anything and so they didn't practice very much, except one stunning exception, the Spartans.

现在形势不妙,我说,"弟兄们,顶住",这些不需要技巧,不需要熟练的动作,也不需要--,你对战场上的一切都无能为力,因此他们也不需要什么操练,唯一让人赞叹的特例,就是斯巴达人

耶鲁公开课 - 古希腊历史简介课程节选