试验: experiment, test, to experiment, experimental...
双重: double...
账单: bill...
赶不上: can't keep up with, can't catch up with, cannot overtake...
安稳: smooth and steady...
容许: to permit, to allow...
看望: to visit, to pay a call to...
营造: to build (housing), to construct, to make...
包装: to pack, to package, to wrap, packaging...
立即: immediately...
