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<command>&lt;&lt;</command>: less than;
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Dependencies: the <literal>Depends</literal> Field
相依性：<literal>依賴</literal> 欄位
<primary>dependency</primary>
<primary>相依</primary>
<primary>package</primary><secondary>dependency</secondary>
<primary>套件</primary><secondary>相依</secondary>
<primary><filename>control</filename></primary><secondary><literal>Depends</literal>, header field</secondary>
<primary><filename>control</filename></primary>
The dependencies are defined in the <literal>Depends</literal> field in the package header. It is a list of conditions to be met for the package to work correctly. This information is used by tools such as <command>apt</command> in order to install the required libraries, tools, drivers, etc., in appropriate versions fulfilling the dependencies of the package to be installed. For each dependency it is possible to restrict the range of versions that meet that condition. In other words, it is possible to express the fact that we need the package <emphasis role="pkg">libc6</emphasis> in a version equal to or greater than “2.15” (written “<command>libc6 (&gt;= 2.15)</command>”). Version comparison operators are as follows:
相依性定義在套件標頭的 <literal>Depends</literal> 欄位。這是情況清單用來滿足套件正確工作所需 — 此資訊用於 <command>apt</command> 之類的工具用來安裝必備的程式庫，以適當的版本滿足套件的相依性。每個相依性，都指定符合其需求的版本。換句話說，像是這樣的，我們需要套件 <emphasis role="pkg">libc6</emphasis> 版本大於或等於 “2.15” (寫法是 “<command>libc6 (&gt;= 2.15)</command>”)。版本的寫法是：
<command>&lt;&lt;</command>: less than;
<command>&lt;&lt;</command>：小於；
<command>&lt;=</command>: less than or equal to;
<command>&lt;=</command>：小於或等於；
<command>=</command>: equal to (note that “<literal>2.6.1</literal>” is not equal to “<literal>2.6.1-1</literal>”);
<command>=</command>：等於 (“<literal>2.6.1</literal>” 不等於 “<literal>2.6.1-1</literal>”)；
<command>&gt;=</command>: greater than or equal to;
<command>&gt;=</command>：大於或等於；
<command>&gt;&gt;</command>: greater than.
<command>&gt;&gt;</command>：大於。
In a list of conditions to be met, the comma serves as a separator. It must be interpreted as a logical “and”. In conditions, the vertical bar (“|”) expresses a logical “or” (it is an inclusive “or”, not an exclusive “either/or”). Carrying greater priority than “and”, it can be used as many times as necessary. Thus, the dependency “(A or B) and C” is written <command>A | B, C</command>. In contrast, the expression “A or (B and C)” should be written as “(A or B) and (A or C)”, since the <literal>Depends</literal> field does not tolerate parentheses that change the order of priorities between the logical operators “or” and “and”. It would thus be written <command>A | B, A | C</command>. <ulink type="block" url="https://www.debian.org/doc/debian-policy/ch-relationships.html#syntax-of-relationship-fields" />
碰到條件時，以逗點做為交集 “and” 符號。以直線 (“|”) 為聯集 “or” 符號 (它是包容性的或 “or”、不是排它性的非此即彼 “either/or”)。優先順序比 “and” 高，可以無限次使用。因此，相依性 “(A or B) and C” 可寫成 <command>A | B, C</command>。另個例子，“A or (B and C)” 應寫成 “(A or B) and (A or C)”，因為 <literal>Depends</literal> 欄位不接受以括號改變邏輯運算元 “or” 與 “and”的優先次序。所以須寫成 <command>A | B, A | C</command>。<ulink type="block" url="http://www.debian.org/doc/debian-policy/ch-relationships.html" />

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zh-TW/05_packaging-system.po, string 75