★ 1. 下載一個包含很多子模塊的工程
例如：git clone --recursive https://github.com/caffe2/caffe2
如果網絡不好或者其他原因導致子模塊沒有下載完全，這時用git pull是無法下載完全的。
注：這是在英文環境中執行的結果，英文Submodule在中文環境中翻譯為“子模組”了。
從log中可以看出，有很多子模塊（為節省篇幅，完整log略，可以自行下載測試）。
$ git clone --recursive https://github.com/caffe2/caffe2
Cloning into 'caffe2'...
remote: Counting objects: 36771, done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 36771 (delta 6), reused 7 (delta 5), pack-reused 36754
Receiving objects: 100% (36771/36771), 149.13 MiB | 2.76 MiB/s, done.
Resolving deltas: 100% (26926/26926), done.
(這里只以子模塊protobuf為例，其他子模塊略)
Submodule 'third_party/protobuf' (https://github.com/google/protobuf.git) registered for path 'third_party/protobuf'
（略）
Cloning into 'third_party/protobuf'...
remote: Counting objects: 47717, done.
remote: Compressing objects: 100% (49/49), done.
remote: Total 47717 (delta 23), reused 23 (delta 5), pack-reused 47657
Receiving objects: 100% (47717/47717), 40.97 MiB | 59.00 KiB/s, done.
Resolving deltas: 100% (32097/32097), done.
Checking connectivity... done.
Submodule path 'third_party/protobuf': checked out 'a428e42072765993ff674fda72863c9f1aa2d268'
（略）
★ 2. 下載子模塊
git submodule update --init --recursive1
如果你不確定子模塊是否都已經下載完全了，也可以執行一遍這個命令確認一下。
★ 3. 參考 git clone --help
•git 2.7.4版本：
--recursive, --recurse-submodules
After the clone is created, initialize all submodules within, using their default settings. This is equivalent to running git submodule
update --init --recursive immediately after the clone is finished. This option is ignored if the cloned repository does not have a
worktree/checkout (i.e. if any of --no-checkout/-n, --bare, or --mirror is given)
•git 2.14.1版本：
--recurse-submodules[=pathspec]
After the clone is created, initialize and clone submodules within based on the provided pathspec. If
no pathspec is provided, all submodules are initialized and cloned. Submodules are initialized and
cloned using their default settings. The resulting clone has submodule.active set to the provided
pathspec, or "." (meaning all submodules) if no pathspec is provided. This is equivalent to running git
submodule update --init --recursive immediately after the clone is finished. This option is ignored if
the cloned repository does not have a worktree/checkout (i.e. if any of --no-checkout/-n, --bare, or
--mirror is given)
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