“Spells”可被共享，“spell-like abilities”则否：
Share Spells: At the master’s option, he may have any spell (but not any spell-like ability) he casts on himself also affect his familiar.
“Spells”的定义：
Magic Overview: A spell is a one-time magical effect. Spells come in two types: arcane (cast by bards, sorcerers, and wizards) and divine (cast by clerics, druids, and experienced paladins and rangers). Some spellcasters select their spells from a limited list of spells known, while others have access to a wide variety of options. Most spellcasters prepare their spells in advance—whether from a spellbook or through devout prayers and meditation— while some cast spells spontaneously without preparation. Despite these different ways that characters use to learn or prepare their spells, when it comes to casting them, the spells are very much alike.
可见，“spells”必须通过“cast”这种动作来生效。
“Cast”这个动作可以被“activate spell completion item”这个动作取代：
Spell Completion: This is the activation method for scrolls. A scroll is a spell that is mostly finished. The preparation is done for the caster, so no preparation time is needed beforehand as with normal spellcasting. All that’s left to do is perform the finishing parts of the spellcasting (the final gestures, words, and so on).
也可以被“activate spell trigger item”这个动作取代：
Spell Trigger: Spell trigger activation is similar to spell completion, but it’s even simpler. No gestures or spell finishing is needed, just a special knowledge of spellcasting that an appropriate character would know, and a single word that must be spoken.
“Boots of speed”既非“spell completion item”，又非“spell trigger item”：
Boots of Speed: As a free action, the wearer can click her boot heels together, enabling her to act as though affected by a haste spell for up to 10 rounds each day. The duration of the haste effect need not be consecutive rounds.
可见，此效果未通过“cast”或其替代动作而生效，故不属于“spells”。
所以此效果属于“spell-like abilities”：
Magic Items: Magic items produce spells or spell-like effects.
可见，此效果不可被共享。
