This is strange because the sorts of lab animals the researchers looked attend to be given lots of food and left to nibble at leisure.
这很奇怪，因为研究人员观察的各种实验室动物往往被给予大量食物，且让它们在闲暇时一点一点蚕食。
The birds nibble at the brickwork.
鸟儿们啄着砖墙。
The birds cling to the wall and nibble at the brickwork.
鸟儿们紧贴在墙上，啄着砖缝。
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