Typically, this material is clear in color, although tinted nylon can be useful in some conditions.
Nylon monofilament leaders sink slowly and may require treatment with a floatant. Nylon also deteriorates with exposure to light and heat. For this reason, nylon leaders have a limited shelf life.
Performance can be adjusted by manufacturers to enhance certain characteristics. Example: trout a thinner, more flexible material is highly desirable as compared to material for a saltwater application where harder, more abrasion-resistant material is needed.
尼龙线：通常是透明的，也有着色的材料。
尼龙是缓沉的，需要处理才浮水。
受热和光照会降低尼龙的性能，所以尼龙线有保质期。
尼龙线生产厂家可以根据钓场鱼种要求来调整性能。
例如：飞鳟鱼就需要更细，更柔软的材料；咸水用就需要更硬，更耐磨。
Fluorocarbon (Fluoro) has a refraction index closer to water than nylon does and is therefore less visible under some fishing conditions. It also does not weaken with water absorption like nylon.
Fluoro leaders sink faster which is useful for subsurface fishing.
Flouro is less affected by heat, UV rays and chemicals, which promotes a longer shelf life.
Many anglers who use fluorocarbon hope or believe it gives them an advantage in calm, shallow, clear water, fishing sunken flies, where the fish’s visibility is good.
Many of these anglers use fluorocarbon only for the section of the leader nearest the fly - the tippet. For saltwater applications some anglers prefer fluorocarbon for its abrasion resistance which can be important for some fish with abrasive mouths and in some highly-abrasive fishing locations.
氟碳线：折射率比尼龙线更接近水，在水中更加隐形，吸水率比尼龙线低。
下沉速度比尼龙线快，可用于水表下
不易受热，紫外，化学品的影响，保质期长
很多钓手使用氟碳线搭配沉水飞蝇，在安静，清澈的浅水钓场对付视力好的鱼；仅仅是延长线段用氟碳线
咸水钓手也喜欢氟碳线的耐磨性能，可以对付粗口鱼和多障碍的钓场
Wire is typically used only when nylon or fluoro won’t work, as they can brings fewer strikes.
Use shortest length and smallest diameter practical for the fish
Single strand wire
Cheap and durable, but prone to kinking
Special connection best - haywire twist
Best for repeated use of a durable fly
Braided and coated wire
Flexible-provides more lifelike fly action
Common knots can be used
Most popular and user-friendly, but less durable than single-strand wire
金属丝：仅在尼龙碳素线玩不下去的时候用，
用金属丝时尽可能短，尽可能细。
金属单丝：便宜耐用，但是容易折；可以持续使用
建议的打结方式：
编织的带涂层的金属丝：柔软如同普通线，可以使用普通的打结方式，常见容易用，寿命不如金属单丝
Tungsten-loaded nylon is useful for deep water or fast-current fly applications.
Varying sink rates available
Turns any floating line into a sinking-tip line
Loops on both ends provide easy connections
Tungsten is expensive
Heavy leaders can be unpleasant to cast
钨粉涂布的尼龙线：用于深水钓场或者需要快速下沉的场合；可以改变沉水速度；将浮水主线改变为沉头线；两头带环便于连接；价格贵；太重了抛投不开心。
课程过半，钓友们是否可以互动一下，转发，分享，赞赏，收藏，订阅，投诉，留言，都可以；别让我有玩单机的感觉。。。
