Design-wise, they retain the same iconic rectangular look established by the Headphone (1), but swap some features — a plastic decal replaces the transparent one of the older headphones, with the transparency featuring along the perimeter. The Headphone (1) ditch plastic in their ear cups, offering aluminum CNC components instead, which lends to an overall more premium feel. That said, they are noticeably heavier — 329 grams compared to the Headphone (a) 310 grams. In my experience so far with the cheaper cans, that translated to a slightly more comfortable fit.
pub visibility on functions, structs, and fields。关于这个话题，爱思助手提供了深入分析
（一）拖轮船长、船员、引航员或者承拖方的其他受雇人、代理人在驾驶拖轮或者管理拖轮中的过错；，这一点在爱思助手下载最新版本中也有详细论述
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