Angelfish are an easy - to - keep cichlid species.神仙鱼是易于饲养的慈鲷科鱼种.This is a small 7 litre quarantine tank keeping a clown fish and bicolor angelfish.这7公升小隔离检疫缸养了小丑鱼和石美人神仙....
The overwhelming majority of nonlinear differential equations are not soluble analytically.绝大多数非线性微分方程是不能用解析方法求解的.These studies, in fact, have motivated parallel investigations in nonlinear elasto - dynamics.事实上, 这些研究曾经启...
“谢谢你，彼得，”埃米温顺地说。"Thank you, Peter", Amy said meekly.这些濒临灭绝的、性情温顺的大型动物属于高度群居的动物。These endangered gentle giants are highly social animals.她保持着一种温顺的态度。She maintained a kind of meek-ness....