She has toiled away at the violin for years.她多年来苦练小提琴。Arnold had his head down, gasping as he toiled up the hill.阿诺德垂着头，一边费劲地往山上爬一边气喘吁吁。They toiled up the hill in the blazing sun.他们冒着炎炎烈日艰难地一步一步爬上山冈。...
这些强制的约束关系可总结为基尔霍夫定律.These constraints are summarized by Kirchhoff's laws.凯蒂: 但是住在校园里是强制的 吗 ?Candy: But is it mandatory to live on campus?节欲和绝育即可能是强制的也可能是自愿的.Both abstinence and sterilization can be enforced or volun...
I'll just play until the janitor comes round to turn the lights out.我会一直玩到门房过来熄灯。That janitor is a snail who never gets things done.那个照管房屋的人动作慢吞吞的,什么事也做不成.The janitor comes round to turn the lights out.看门人巡视一圈，把灯熄灭。...