This battery booster is a boon for photographers.这种电池充电器是摄影工作者的好帮手。He was tall, dark and handsome, like a Mills and Boon hero.他个头高大、皮肤黝黑、相貌堂堂，像通俗爱情小说的男主角。A car is a real boon when you live in the country.在郊外居住,有辆汽车确实极为方便...
The organisms can be divided into discrete categories.有机体可分为许多互不相联的种类。The picture consists of a lot of discrete spots of colour.这幅画由许多不相连的色点组成.Mutual exclusion is the rule in both discrete and contiguous selection.互斥对离散选...
Callahan posits that chemical elements radiate electromagnetic signals.卡拉汉假定化学元素放射电磁信号。Her hypothesis concerns the role of electromagnetic radiation.她的假说涉及到电磁辐射的作用.Some people are worried that electromagnetic fields from...