He started to hack away at the tree bark.他开始砍树皮。I set the log on the ground and shaved off the bark.我将原木放到了地上，刨掉了树皮。This tree is always recognizable by its extremely beautiful silvery bark.这种树很容易辨认，因为它有着非常漂亮的银色树皮。...
The diseased trees are marked by protuberances on their bark.有病的树木可由其树皮上的结节看出.All wooden dunnage or packing material must be bark free.所有木衬板或填充料必须任意是吠声.I set the log on the ground and shaved off the bark...我将原木放到了地上，刨掉了树...
Mark has been Luke's sidekick since junior high school.打从初中开始,马克和卢克一直就是哥儿俩.They were stuck on each other ever since junior high school.打从初中开始,他们就彼此相爱.What is your best memory from junior high school?初中最好的记忆是什么?...
Insulin is produced commercially from animals.为获利从动物体内提取胰岛素。Insulin is secreted by the pancreas.胰岛素是胰腺分泌的。Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的....