It made his great nose protrude more arrogantly; it emphasized his cheekbones; it made his eyes seem larger. There were deep hollows at his temples. His body was cadaverous. He wore the same suit that I had seen him in five years before; it was torn and stained, threadbare, and it hung upon him loosely, as though it had been made for someone else. I noticed his hands, dirty, with long nails; they were merely bone and sinew, large and strong; but I had forgotten that they were so shapely. He gave me an extraordinary impression as he sat there, his attention riveted on his game -- an impression of great strength; and I could not understand why it was that his emaciation somehow made it more striking.
Presently, after moving, he leaned back and gazed with a curious abstraction at his antagonist. This was a fat, bearded Frenchman. The Frenchman considered the position, then broke suddenly into jovial expletives, and with an impatient gesture, gathering up the pieces, flung them into their box. He cursed Strickland freely, then, calling for the waiter, paid for the drinks, and left. Stroeve drew his chair closer to the table.
请教老师：and I could not understand why it was that his emaciation somehow made it more striking. 中的 it was that 如何剖析成分和含义？ 感觉去掉it was that, 变成 why his emaciation somehow made it more striking. 含义也通顺呀？
还有一点，calling for the waiter 中的for应该去掉呀？由于call for sb 是去接某人的意思呀？
why it was that... 为强调句型强调缘由状语，然后用作名词性从句。这就是为何你删去it was that, 句子仍然是成立的。
call在这里为不及物动词， 意为： to shout or say something loudly to attract somebody’s attention。譬如你大声喊道，“Bill，please." (买单）。for the waiter是目的状语。不可省略介词for, call somebody, 成了给某人打电话的意思了。
