in or into a particular place, thing,
在那裡；在其中；在那點上
例: The learning and teaching resources covering different Key Learning Areas (KLAs)/subjects at various stages of learning are provided on the EDB One-stop Portal. We will continue
to enrich and update the resources therein to enable teachers to obtain relevant materials to facilitate learning and teaching.
hitherto=before this time, until now
e.g. All attempts to make helium enter into stable chemical union have hitherto proved unsuccessful.
whereby=by which way or method:此，從而；藉以
They've set up a plan whereby you can spread the cost over a period. 他們已經制訂了這樣一個計劃，允許在一段時間內分期付款。
We need to devise some sort of system whereby people can liaise with each other. 我們需要設計一套辦法，人們能夠藉以互相保持聯絡。
(注: thereby是近似的字,意思是as a result of this action[因此，由此；從而], 例:
Diets that are high in saturated fat and cholesterol tend to clog up our arteries, thereby reducing the blood flow to our hearts and brains.
高飽和脂肪和高膽固醇的飲食容易阻塞我們的動脈，從而減少向心臟和大腦的供血。)
wherein=in which, or in which part 在哪方面，在哪裡
He gazed once more around the room, wherein were assembled his entire family. 他再一次環視房間，他全家人都在那裡。
He was certainly a pleasant man but wherein lay his charms, she wondered. 他無疑是個討人喜歡的人，但她不知他的魅力何在。
Whence是什麼?是from where.
例句：What, Lord, do I wish to say except that I do not know whence I came to be in this mortal life. (St. Augustine, Confessions)
