It's usually wise to leave your out - of - tryst where you found it.离开那些你能找到的外乡约会通常是明智的.It has been said that art is a tryst, for in the joy of it maker and beholder meet.有人说艺术是一种幽会，因为艺术家和欣赏者可在幽会的乐趣中相遇在一起。a lovers’ ...
Wasterwater from pulping and papermaking is one of the important pollution sources.制浆造纸废水是工业废水中的重要污染源.The other main type of chemical pulping is called the sulfite process.另外一种重要的化学制浆称亚硫酸盐工艺.Optimum conditions of kraft p...