寄一盘新磁带过去不合算。It would be uneconomical to send a brand new tape.花钱修理不合算。It would be uneconomic to try and repair it.即使价格更高一些，这仍然很合算。This was still a good buy even at the higher price....
A lack of magnesium causes muscles to go into spasm.缺镁会导致肌肉痉挛。Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素.The water contains high amounts of magnesium.这水含有大量的镁....
在纸板上涂两三层清漆使其变硬。Give the cardboard two or three coats of varnish to harden it.这种材料需要有更高的温度和压力才能凝结变硬。The material requires higher temperatures and pressures to set hard.雪成冰后变硬了.The snow hardened until ice was formed....
The series was based on the autobiographies of the author.这部连续剧是根据那位作家的自传拍摄的.There are some songs and, recently, a few autobiographies about peasant experience.有些歌曲描述了农民的经验, 最近还出了几本自传.Not so much The Da Vinci Code, but F...