然而，我们必须注意到在那个使用汽车的成本正在快速增长的同时，与通勤越来越差。
However, we must notice at the same time that the cost of using a car is growing fast, and the commute is getting worse.
传统的存取柜系统得到了广泛的应用，但有安全性差、使用不便和维护成本高等缺点。
Storing compartment system has been widely used, though its poor in security, inconvenience to use, high cost of maintenance.
铸造工业用天然钙基膨润土，不仅使用效果差，而且只能使用一次，且不能复用，生产成本高。
The natural ca bentonite is used in foundry industry with bad result, can't be reused and its production cost is high.
二是通常使用的全氟磺酸质子交换膜的成本高且阻醇性能差。
One is low methanol oxidation activity at the anode, and the other is methanol crossover from the anode to the cathode through the membrane.
二是通常使用的全氟磺酸质子交换膜的成本高且阻醇性能差。
One is low methanol oxidation activity at the anode, and the other is methanol crossover from the anode to the cathode through the membrane.
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