The parameters Auv and Adv are fixed using the quark counting rules and Ag is fixed using the momentum sum rule. The requirement xu¯=xd¯ is imposed as x→0 through corresponding conditions on AU¯, AD¯, BU¯, BD¯ and fs. There are thus a total of 14 PDF free parameters...
*Everyone has to conform to the company’s dressing code rules about what you can wear.每个人都必须遵守公司的着装规定。 26、be conducive to 有利于,有助于 *Exercising regularly can be conducive to a balanced life. 规律运动有利于健康平衡的生活。 27、devote to sth 致力于,奉献=commit oneself ...
A Learning to speak is automatic for almost all children, but learning to read requires elaborate instruction and conscious effort. Well aware of the difficulties educators have given a great deal of thought to how they can best help children learn to read. No single method has triumphed. Inde...