This design is in pastel colours with three rectangles and three triangles.这一设计由淡色的3个长方形和3个三角形构成。The open rectangles represent typical elements of the ion fluid.空心的矩形表示典型的离子流体元.This design is in pastel colours with three...
Aircraft production continued to plod along at an agonizingly slow pace.飞机制造业仍旧举步维艰，发展速度之缓很让人头疼。He was destined to plod the path of toil.他注定要在艰辛的道路上跋涉.They had to plod wearily on up the hill.他们不得不迈着疲倦的步子登上山....
We are here to protect and assist the weak and infirm.我们来这里保护、帮助年迈体弱者。care for the elderly and infirm对年老体弱者的照顾He was over eighty years of age, infirm and totally blind.他八十多岁了,身体虚弱, 双目失明....